Hobgoblin Warcaller

Ambush {1}{r}{r}{r}{g} (You may cast this for
its ambush cost any time you could cast an instant. If you do, it gains haste, and it's returned from the battlefield to it's owner's hand
at the beginning of the next end step.)
When Hobgoblin Warcaller enters play, Goblins you control gain first strike until
end of turn.