Octomancer

Gift is a mechanic built on a bribe: you hand an opponent something real in exchange for a payoff of your own, and this card turns that transaction into a self-supplying seed. Promise the Octopus and your opponent creates an 8/8 blue token, which is exactly the kind of large, freshly-entered token the end-step trigger wants to target. Because the copy clause looks only at tokens that entered the battlefield this turn, the gifted Octopus qualifies on the turn you cast this: at that end step you make a copy of it under your own control. That is the loop the gift closes by hand, converting a concession on someone else's side of the table into your first 8/8. The engine has a natural limit in durability. The gifted token does not keep re-entering, so it feeds the trigger once, not indefinitely; sustaining the engine on later turns means supplying fresh tokens yourself, which is where any deck spilling creature tokens onto the board takes over. The end-step ability is agnostic about who owns the token it copies, so a board that generates something new each turn keeps the copies coming; a board that goes quiet leaves the frog druid as a plain 3/3 with nothing to duplicate. The body does none of the heavy lifting. The value lives in that timing window, and the gift is the one-time political trick that guarantees the window has something worth targeting the turn it opens.