Benefactor's Draught

The untap clause is the part that gives this away as a multiplayer combo piece rather than a combat trick. Untapping all your creatures (the word is all, not just your team) at instant speed turns a board of mana dorks or tap-for-value bodies into a second mana phase mid-combat, and pairs with anything that wants to attack and then still have its creatures upright. But the real reward is buried in the conditional draw: it triggers off opponents' creatures blocking, not yours attacking, so the card pays out best when you swing wide into a board that has to commit blockers to survive. Against a single opponent that draw is incidental; across a table where multiple players are throwing chump blockers in front of a green army, the riders stack into a serious refill. The guaranteed card at the end keeps it from ever being a blank: even in a stalled-out game with nothing to untap and no profitable attack, you cycle it for a card at instant speed. That floor is what lets it sit in a deck as a flexible combat-and-mana trick that occasionally explodes into a fistful of cards, rather than a do-nothing that needs the perfect attack to justify the slot.