Primal Adversary

Pay nothing and it lands as a 4/3 that ate your turn; pay everything and your manabase walks into the red zone. The trigger reads like a mana sink, but the payment does two jobs at once: each stacks a +1/+1 counter, and you may animate up to that many of your own lands into 3/3 hasty Wolves that keep their mana ability. So you haven't cannibalized your ramp, and the board that arrives is already committed to attacking the turn it appears. The wrinkle is what those animated lands become: permanent creatures, exposed to a sweeper or a spot removal spell in a way an untapped land never is. A wrath here doesn't just empty the board, it strips the mana you sank in and the land drops both, punishing exactly the player who leaned hardest on the payment. Trample on the base body is the small tax that keeps a lone survivor relevant once the pack is gone. This is the flexible-mana threat done right: a curve-topper that reads as a durdle and a game-ender in the same breath, depending on how much you're willing to leave exposed. The decision is the design, made with full information, staring at your own land count and asking how much of your manabase you can afford to turn into a mortal thing.