Gruul Elemental

When Gruul Elemental enters the battlefield,
destroy target artifact if {r} was spend to cast
Gruul Elemental.
When Gruul Elemental enters the battlefield,
destroy target enchantment if {g} was spend to
cast Gruul Elemental.
Evoke {r/g} (You may cast this spell for its evoke cost.
If you do, it's sacrificed when it enters the battlefield.)