Emptiness

What looks like a color-identity choice is really a payment made at the moment of casting: the two hybrid pips let you spend whatever combination your mana allows, and the two enter-triggers each check what actually hit the pool. Spend anywhere across the six mana and you reanimate a small creature from your graveyard; spend and you shrink a target with three -1/-1 counters. The generic is where the design gets subtle, because those pips need not come from the hybrid symbols. A build that runs both colors can point colored mana at the generic portion (paying ) and satisfy both conditions off a single cast, reanimating and shrinking in one enter. That upside is gated by manabase discipline: to fire both, you have to assemble a specific spread of colored sources, and any turn you can only muster one color's double gets you one mode and a 3/5 body. Evoke is the counterweight to that ambition. It buys a mode for the cheapest possible payment and sacrifices the Elemental on entry, so you get the trigger and nothing behind it; keeping the body on the battlefield means hard-casting the full amount. A reanimation deck and a removal deck are asking two different questions of the same card, and a deck built to ask both at once pays for the privilege in fixing. The mode is decided by how you pay rather than chosen freely on cast, and the sacrifice option and the double-pip requirements pull in opposite directions.