Armageddon (Preston Poulter) (SB) [Pro Tour Collector Set]Set: Pro Tour Collector Set Type: Sorcery Rarity: Rare Cost: {3}{W} Destroy all lands.

and briefly

−X: Sorin

attach it to a creature you control

Set: XY: Fates Collide Type: Dragon Rarity: Ultra Rare Retreat cost: Colorless

Set: Judge Gift Cards 2015 Type: Sorcery Rarity: Rare Cost: {2}{B}{B} Destroy all creatures

Wreckage from the Phyrexian Invasion provided the rats with a seemingly unlimited number of breeding grounds

Probably fine

{1}: Return Oboro

Set: Urza's Legacy Type: Artifact Rarity: Rare Cost: {2} Each spell costs {3} more to cast except during its controller's turn

Set: Unhinged Type: Instant Rarity: Uncommon Cost: {B} Open a sealed Magic booster pack

Its tines cannot be rung by mere physical force

Set: Black & White: Next Destinies Type: Fire Rarity: Ultra Rare Retreat cost: Colorless