Greenwarden of Murasa
Most regrowth-on-a-stick designs give you the body and the recursion once, then ask you to be content with a creature that already paid for itself. This one refuses to spend its value all at once. The enters trigger is the familiar half: any card back from the yard, no questions asked. The death trigger is where the design gets greedy on your behalf, but it makes you pay the toll honestly. To get the second return you have to exile the creature itself, which means the value is sequential, not infinite: you cannot loop it through a sacrifice outlet and a flicker engine to drain a graveyard dry, because each death permanently removes the engine from the board. That exile clause is the load-bearing restriction; without it, a green Sun Titan with two Eternal Witness triggers would have been a recursion machine that never stopped. Instead you get two distinct windows of advantage spread across the creature's life, and a choice on the back end about whether the card you want back is worth surrendering the elemental for good. The 5/4 body is almost incidental, large enough to trade up or pressure a planeswalker, but the card is bought for the bookended value, not the beats. It is the cleanest statement of the principle that recursion is most interesting when it is finite by construction rather than by mana cost.
