If the new creature still has greater power, greater toughness, or both, you put a +1/+1 counter on the creature with evolve
There's no problem here with Eldrazi Unbound , as it's one of the better mana bases for a given Commander precon
Temur Roar Temur Roar keeps things simple with a classic battlecruiser strategy that churns out dragons faster than your opponents can keep up with them
Its also a 1-mana answer that doesnt get countered by a Chalice of the Void on 1, doesnt get cascaded into in decks like Living End or Crashing Footfalls, and so much more
Vanishing 2 (This creature enters the battlefield with two time counters on it At the beginning of your upkeep, remove a time counter from it When the last is removed, sacrifice it.) Whenever a player casts their second spell each turn, proliferate
Are your opponents playing fast combo decks or slow control decks