Arena
Land
{3}, {T}: Choose a creature you control. An opponent chooses a creature he or she controls. Tap both creatures. Each of those creatures deals damage equal to its power to the other.

Giant Badger
{1}{G}{G}
Creature -- Badger
2/2
Whenever Giant Badger blocks, it gets +2/+2 until end of turn.

Mana Crypt
{0}
Artifact
At the beginning of your upkeep, flip a coin. If you lose the flip, Mana Crypt deals 3 damage to you.
{T}: Add {2} to your mana pool.

Nalathni Dragon
{2}{R}{R}
Creature -- Dragon
1/1
Flying, banding
{R}: Nalathni Dragon gets +1/+0 until end of turn. If this ability is played four or more times during this turn, sacrifice Nalathni Dragon at end of turn.

Sewers of Estark
{2}{B}{B}
Instant
Choose one -- Target attacking creature is unblockable this turn; or prevent all combat damage that would be dealt by target blocking creature and all creatures it's blocking this turn.

Windseeker Centaur
{1}{R}{R}
Creature -- Centaur
2/2
Attacking doesn't cause Windseeker Centaur to tap.