Shefet Dunes

The Desert subtype is what turns this from a fixer into a payoff. The mana side is the familiar trade: colorless for free, white for a point of life, the same compromise the painland tradition has always asked. What separates it is that it is both a Desert and a Desert-eater: the activation sacrifices a Desert to hand your whole board a +1/+1 boost until end of turn, so a manabase built around the subtype carries its own finisher. The sorcery-speed restriction is the discipline here, and it cuts against the anthem in a specific way: because the pump can only fire on your own main phase, it lands before combat rather than mid-attack, which hands the opponent perfect information. They see the board grow, then declare blocks and aim removal knowing exactly what the swing is. There is no instant-speed ambush; the overrun has to win through combat math the opponent can fully read, not around it. Until then the land does ordinary work, tapping for mana while it waits for the stall that makes cashing a spare Desert into a swing worthwhile. And because the cost sacrifices any Desert (this one included, or another if you would rather keep it producing mana), a deck running several can feed the ability from elsewhere and treat it as recurring rather than one-shot. That is deliberate redundancy: the deeper into Deserts you go, the less any single sacrifice costs you.