When you cast your next creature spell of that type this turn, that creature enters the battlefield with an additional +!/+1 counter on it
For the rest of the game, youre getting to double your Adventure effects for no extra cost, and they range from killing creatures to bringing your creatures back to drawing cards to simply killing your opponent
Oh, and both Niv-Mizzets go infinite and can wipe a table with just Curiosity, arguably Izzet's most famous combo
WotC hit it out of the ball park in trying to capture the feel of the Final Fantasy Universe in a card game
CHONG AND LILY, NOMADS If nothing else, remember that this can go in Tom Bombadil, which makes it a huge pick-up
There aren't many other red cards with such a seasoned charm