Crackleburr

Two activated abilities pulling in opposite directions, sharing nothing but the same pool of hybrid pips. The red half wants your creatures untapped, turning them into a repeatable three-damage cannon; the blue half wants them tapped, spending the untap symbol to bounce a creature to hand. One mode burns through your board's tapped state, the other through its untapped state, and each demands bodies of a specific color: two untapped red creatures to fire the burn, two tapped blue creatures to power the bounce. The opposed economies are the entire premise, and the clever wrinkle is how a single dual-colored body threads both needles. Anything that counts as red and blue at once can tap to help pay the burn, and then, now sitting tapped and blue, untap to help pay the bounce, so the two halves are less mutually exclusive than they first read. The untap-cost bounce is the rarer trick, since few cards use the untap symbol at all, and fewer still gate it behind untapping creatures of a particular color rather than tapping for mana. Most builds lean on one half and treat the other as upside, because assembling enough red and blue bodies in the right tap states is a real constraint on deckbuilding and sequencing alike. As pure puzzle design it remains one of the more demanding hybrid creatures of its era: the rate is fine, but the cost is your whole board's tap state, sorted by color, on the turn you want to use it.