Creature Gate

During your Draw Step, reveal the first card you
draw; if it is a creature, you may play it without
paying its mana cost. If you do, it has haste and
you must sacrifice it at the end of your turn. If
you do not, put it into your hand.
{t} Add one mana of any color of the revealed
card's mana cost, even if its not a creature.
Creature Gates, AKA Monster Spawners, aren't as rare
as some people would like.