Mountain

This spell can't be countered.
Fry deals 5 damage to target creature or planeswalker that's white or blue.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Destroy target creature.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets +0/+2 and has reach. (It can block creatures with flying.)

Island

Okk can't attack unless a creature with greater power also attacks.
Okk can't block unless a creature with greater power also blocks.

Prevent all combat damage that would be dealt this turn.

Swamp

Enchant creature
Enchanted creature has flying and "Whenever this creature deals combat damage to a player, venture into the dungeon." (Enter the first room or advance to the next room.)