I have not read through the entire forum yet but here are two abilities I made that I have used occasionally, hopefully they don't overlap to much with other abilities.
Headbang X (When this creature fights another creature, it gets +X/+0 until end of turn, where X is the number referred to on the card.)
Relentless (When this creature attacks or blocks, it gets +1/+1 until end of turn for every other combat it attacked or blocked in.)
Mechanics I'm using for my cards. Hopefully they don't overlap with other abilities.
Opportunist (cost) (If an opponent attacks with two or more creatures, you may cast this spell for its opportunist cost and you may cast it as if it had flash.)
Aggressor (Whenever this creature attacks, create a red 1/1 goblin creature token with "This creature can't block" tapped and attacking the same target as this creature.)
Profuse is a keyword that grants bonus effects to spells or permanents if you have five +1/+1 counters among all permanents you control.
Etherealize {cost} (You may cast this spell for its etherealize cost. If you do, it enters the battlefield as an enchantment instead of any other permanent type.)
Example: (I apologize for the formatting, it was the best I could do.)
My homebrew mechanic, Ready! It works similar to Monstrosity or Adapt.
Ready: {m}. (If this creature is not readied, it becomes readied. Readied creatures have vigilance. A creature that's readied untaps at the beginning of your end step.)
Slide (When attacking, only cards with Haste or Vigilance can block it and only a second blocker deals damage to it)
Regrowth (When blocked, double power, when blocking, double toughness)
Servant (When a Planeswalker owned by you is in play, halve this cards power and halve all loyalty/mana costs)
Support (This Creature cannot attack but, if tapped with another card, it will add its power)
Luck (If blocking, flip a coin. If heads, the attacker deals no damage)
Unluck (If blocking, flip a coin. If heads, the attacker deals double damage)
Corruption (Every time this card attacks, flip a coin. If heads, flip again. If tails, stop. On the second flip, if heads, exile two cards and give the card attacked Corruption)
Enlighten N(As long as you have N or more non-land spells in your graveyard, you may put N +1/+1 counters on this creature and it becomes enlightened.) Similar to monstrosity.
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Headbang X (When this creature fights another creature, it gets +X/+0 until end of turn, where X is the number referred to on the card.)
Relentless (When this creature attacks or blocks, it gets +1/+1 until end of turn for every other combat it attacked or blocked in.)
Opportunist (cost) (If an opponent attacks with two or more creatures, you may cast this spell for its opportunist cost and you may cast it as if it had flash.)
Aggressor (Whenever this creature attacks, create a red 1/1 goblin creature token with "This creature can't block" tapped and attacking the same target as this creature.)
Profuse is a keyword that grants bonus effects to spells or permanents if you have five +1/+1 counters among all permanents you control.
Obviously only works in a commander or brawl format.
It's basically Annihilator except it forces exile instead of sacrifice.
It's a middle ground between flying and not-flying. It's meant to represent cavalry in a world of infantry, cavalry, and air power.
https://mtgcardsmith.com/view/headlong-charge
Example: (I apologize for the formatting, it was the best I could do.)
Tangle X- When this creature attacks tap X target non-flying creatures that defending player controls.
Profess- When you cast a spell this creature gets +1/+1 until end of turn
Burrows- This creature can't be blocked by flying creature and/or creatures that share it's colors
Mystical (Whenever this creature deals combat damage to a player, you may draw half of that many cards, rounded up.)
This is my example card:
http://mtgcardsmith.com/view/moonsinger
Example:
Ready: {m}. (If this creature is not readied, it becomes readied. Readied creatures have vigilance. A creature that's readied untaps at the beginning of your end step.)
Here's a link to a demonstration of a card with ready if ya wanna check it out; https://mtgcardsmith.com/view/steadfast-recruit-1
Regrowth (When blocked, double power, when blocking, double toughness)
Servant (When a Planeswalker owned by you is
in play, halve this cards power and halve all loyalty/mana costs)
Support (This Creature cannot attack but, if tapped with another card, it will add its power)
Luck (If blocking, flip a coin. If heads, the attacker deals no damage)
Unluck (If blocking, flip a coin. If heads, the attacker deals double damage)
Corruption (Every time this card attacks, flip a coin. If heads, flip again. If tails, stop. On the second flip, if heads, exile two cards and give the card attacked Corruption)
Singular (This creature can't be blocked by more than one creature)
for each legendary creature on the battlefield.)
Similar to monstrosity.
Similar to imprint