Make you own Mechanic (and post it here for others to see and review)
This is a card discussion forum where we create custom mechanics and discuss them with the rest of the group. Have fun, and don't spam cards. I'll start.


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https://mtgcardsmith.com/view/kharis-redeemed-1?list=user
Note: The mechanic is from some guy at Instagram. It's not an original idea of mine. I just want to know about your opinions though.
https://mtgcardsmith.com/view/velia-hero-in-training-1?list=user
Note: This one is taken from a card game similar to MtG. Also not exactly an idea of mine tbh.
I can see the potential and purpose for mastery. The example that you've given for it feels pretty weird as a demonstration, though, because unless somebody reduces its power (which is rare) then it's always going to happen in combat, which I suspect would be the primary source of triggers for the mechanic on most cards.
Could possibly make interesting synergies, I dunno...
Used in this saga:
https://forums.mtgcardsmith.com/discussion/5206/race-to-the-home-of-the-chalice-of-gold-enter-now-matey#latest
(Link is above.)
https://mtgcardsmith.com/view/comfy-bed-1
https://mtgcardsmith.com/view/slumbering-scribe?list=user
https://mtgcardsmith.com/view/dekrus-thief-of-wills
https://mtgcardsmith.com/view/doppelgeist
Possess is found on Spirits in the Esper (White-Blue-Black) wedge. Spirits' Possess costs are meant to be almost always higher than its mana cost, so casting them is generally cheaper. When a player gains control of a creature via Possess, that creature is possessed until it leaves the battlefield. Some cards, like Dekrus and Doppelgeist, interact with possessed creatures in ways such as giving them abilities/bonuses or using them as resources. For most Spirits with Possess, possession would be a one-shot deal; the ability to return from exile without the use of other cards is unique to Dekrus.
Also. Awesome mechanic idea. Really in flavor with spirits (since they possess beings and all) I could actually see this as a future mechanic.
My issue with possess is that has the potential to dramatically change the game, and I think that on common, the effect could still be balanced, but it could alter the game too much.
And, I think your mechanic could certainly be supported and built around. Definitely good for a set.
As for possess, that sounds a lot better!! I do still feel a little nervous about that type of mechanic interacting with commons, but I think your suggestion would be okay!
(As this song enters and after your draw step, choose a mode that hasn't been chosen. If you can't, sacrifice CARDNAME.)
(I don't know why the third image ended up smaller.)