Treetop Village 6.5 Some wrath protection, some exrta bodies when you need to power up effects or threaten planeswalkers
It's not quite on the level of Teferi's Protection, but saving yourself from an opponent swinging out can turn the game in your favour no matter what
On Play, it can give 1 of your Leaders +2000 power until the start of your next turn, and you cant add Life cards to your hand (at least, not with your own effects) during the same turn
Then I thought about an ability that destroyed artifacts and created mana
Freerunning is an alternative cost, not an activated ability or anything, so you can cast creature spells for their freerunning cost with Caverns colored, uncounterable mana
To play substitute cards in a tournament they must have an official Magic card back, clearly indicate the name of the card youre substituting, and you need to own the actual card