Indoctrination Attendant

The enters-the-battlefield bounce is the interesting engine here, not the poison. Returning a permanent you control to your hand reads like a drawback; here it is the fuel. Bounce a creature with its own enters trigger and you buy the chance to recast it for a second helping; bounce a temporary token or a permanent that has already spent its usefulness and you convert that tempo hit into a body that ferries poison counters. The Mite it makes carries toxic and cannot block, which fixes its role as pure offense rather than a chump: this turns the reset button into an aggressive resource. The toxic on the caster itself keeps the poison plan ticking even when the bounce line is idle, giving a floor of a 3/4 that threatens the alternate loss condition every combat. The tension is between the two clocks the card can pursue: it can be a value piece that recurs your own enters triggers by picking permanents up and replaying them, or it can be a poison enabler assembling a swarm that races to ten counters. Neither line is loud on its own, which is why "return another permanent" phrasing matters so much: it is what lets the card build rather than beat, rewarding a board already stocked with cheap enters-the-battlefield triggers and disposable permanents you would happily recast. The mana cost of that recursion, not exile-and-return, is the honest brake on the loop.