Teim, Jade Runner

Haste, Flash, Eternal—You may cast
this card for {0} if a player has cast two or more
creatures this turn.
Whenever you draw a card, if it is a spell, you
may reveal it and pay {x}, where X is the card's
converted mana cost. If you do, this card gains
+X/+X and can't be blocked until end of turn,
where X is the converted mana cost of the card
revealed.