Raven Familiar [Urza's Legacy] Alliances Two-Headed Dragon can block an

Two-Headed Dragon can block an additional creature each combat

forming a canopy that protects us all

how would I know it worked

then sacrifice a permanent

Raven Familiar [Urza's Legacy] Alliances Two-Headed Dragon can block anSet: Urza's Legacy Type: Creature Bird Rarity: Uncommon Cost: {2}{U} Flying Echo {2}{U} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When Raven Familiar enters the battlefield, look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.