Mountain

Ruby Leech

First strike
Red spells you cast cost {R} more to cast.

Jade Leech

Green spells you cast cost {G} more to cast.

Swamp

Sol Ring

Prossh, Skyraider of Kher

When you cast this spell, create X 0/1 red Kobold creature tokens named Kobolds of Kher Keep, where X is the amount of mana spent to cast it.
Flying
Sacrifice another creature: Prossh, Skyraider of Kher gets +1/+0 until end of turn.

Andradite Leech

Black spells you cast cost {B} more to cast.
{B}: Andradite Leech gets +1/+1 until end of turn.