Tolarian Academy [Urza's Saga]

Tolarian Academy [Urza's Saga]Set: Urza's Saga Type: Legendary Land Rarity: Rare {T}: Add {U} for each artifact you control. The academy worked with timeuntil time ran out.

which leaves it bitter

sacrifice Hecatomb unless you sacrifice four creatures

Set: Commander 2013 Type: Artifact Rarity: Rare Cost: {4} Whenever you gain life

But I doubt it

Set: Conflux Type: Instant Rarity: Uncommon Cost: {W} Exile target creature

Set: Black & White: Dragons Exalted Type: Water Rarity: Uncommon Retreat cost: Colorless

Ob Nixilis Type: Legendary Planeswalker — Nissa Rarity: Mythic Cost: {1}{G}{G} +1: Create a 0/1 green Plant creature token

Set: Black & White: Base Set Type: Item Rarity: Uncommon

Dragons Type: Sorcery Rarity: Common Cost: {1}{R} Create two 1/1 red Goblin creature tokens

Set: Masters 25 Type: Sorcery Rarity: Rare Cost: {4}{W}{W} Destroy all artifacts

Urza was stunned to find that common silver passed through the portal undamaged

and whenever you cast a Dinosaur spell this turn