@TenebrisNemo That is a really cool design. I love the flexibility and all the decisions that are baked in on when to have shroud, when to leave mana up, etc. It's definitely odd to have tap abilities on an equipment. I have a feeling this card would force a lot of players to learn that equipment aren't tapped when the creature they're attached to becomes tapped and vice versa.
@Mellow_MC You said you added a lot of text, but, I would actually add some more. I'm assuming that the chosen creature leaving a battlefield could happen any time, not just in the same turn, which usually means you'll need to create a counter or something. I'd consider creating an aura that attaches to the chosen creature, and has "When this leaves the battlefield, exile the top 5 cards of target player's library. You may play artifact cards exiled this way until the end of your next turn." The concept is pretty awesome. I'd consider just running him as the commander, and fill the deck with blink and flicker effects. Very cool card.
The first ability lets you trade your creatures to get double value out of the spells Thada Adel steals. The second ability allows you to attack with Thada Adel to steal something, even if there's no chance of it getting through.
There are other tricks that can be done with Tidal's second ability, such as using instant speed sacrifices to guarantee stealing a card after combat damage has been dealt, even for unblocked creatures. The casualty that Tidal grants to your stolen instants would also count towards this.
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https://mtgcardsmith.com/view/thief-of-opportunity
The first ability lets you trade your creatures to get double value out of the spells Thada Adel steals. The second ability allows you to attack with Thada Adel to steal something, even if there's no chance of it getting through.
There are other tricks that can be done with Tidal's second ability, such as using instant speed sacrifices to guarantee stealing a card after combat damage has been dealt, even for unblocked creatures. The casualty that Tidal grants to your stolen instants would also count towards this.