Bog Serpent
{5}{B}
Creature -- Serpent
5/5
~this~ can't attack unless defending player controls a Swamp.
When you control no Swamps, sacrifice ~this~.
Gorilla Pack
{2}{G}
Creature -- Ape
3/3
~this~ can't attack unless defending player controls a Forest.
When you control no Forests, sacrifice ~this~.