Latulla, Keldon Overseer

Most repeatable damage engines are gated by mana alone. This one gates on card economy instead: every shot costs two cards plus on top of the tap, which makes the rate punishing unless your hand is overflowing. That discard requirement is the lever that kept the Spellshaper template from being strictly better than the spells these creatures imitate. The whole class took instant and sorcery effects and stapled them to a body without printing the spell twice, and the discard cost was the price that kept the copy honest. Latulla sits at the high end of that lineage: a scalable burn source tethered to a 3/3, able to finish a game or clear a blocker, but only for a player willing to liquidate their hand to do it. A deck that treats cards as fuel rather than a resource to husband can feed this engine repeatedly; one that hoards finds it inert. The body is almost incidental. This is a battery, and the only question it asks is whether you have enough cards to keep feeding it.