Raven Familiar [Urza's Legacy] Alliances Set: Champions of Kamigawa Type:

Set: Champions of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {4}{R} You may put a creature card from your hand onto the battlefield

how would I know it worked

then sacrifice a permanent

Set: Unstable Type: Sorcery Rarity: Common Cost: {4}{R}{R} Roll a six-sided die

{T}: Attacking creatures get +1/+0 until end of turn

Raven Familiar [Urza's Legacy] Alliances Set: Champions of Kamigawa Type:Set: 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.