Nulltread Gargantuan

A 5/6 for three mana is a body the color pie does not hand out at that rate, and the enters ability is the bill: put a creature you control on top of its owner's library. Read straight, the Gargantuan tucks itself, costing a draw step and likely a land off the top, so the tempo only evens out if you have something better to send back. Because the ability does not target (the choice is made on resolution, not when it goes on the stack), the question stays open: which creature would you rather buy back to the top of your deck? Bounce a creature with its own enters effect and you set up replaying it next turn, laundering one high-value trigger through your draw step. Choose a token and the ability still resolves cleanly: the token reaches the top of the library and ceases to exist there as a state-based action, so the trigger spent itself doing nothing. The phrasing carries the whole puzzle. "A creature you control" lets you spread the cost onto something other than the Gargantuan, turning a self-bouncing beater into a one-shot recursion tool wearing an oversized frame. The catch is that this is exactly that: a single enters trigger, fired once when the body lands. The rate is the headline; the trigger is the work, and the distance between those two readings is where the card actually lives.