Dictate of Heliod

Flash is the entire reason this anthem matters. Static team-pump enchantments are a known quantity, the design lineage that runs through Glorious Anthem and its kin: cheap, permanent, sorcery-speed, telegraphed a turn in advance. Bolting flash onto the effect changes the axis it operates on. A static +2/+2 is a deckbuilding decision the opponent plays around; the same effect at instant speed is a combat trick that happens to stick around afterward. The window is what does the work. Cast it after blockers are declared and a profitable block becomes a four-creature blowout; cast it in response to a sweeper's damage and a board the opponent thought was dead survives; hold it on an empty stack and it pumps the team forever. Two mana more than the simplest anthem buys both the flexibility and a larger boost, and the math on a flashed +2/+2 across a developed board justifies the rate in a way that a +1/+1 effect at the same speed would not. The card asks for a board already committed, then rewards you for committing more on a turn the opponent cannot see coming. It is not subtle, but the timing makes it dangerous: you do not need to out-think the opponent so much as out-mana them at the exact moment the combat math flips.