Guilds of Ravnica - Buy a box promo

Sadly we can't afford to buy a box of any set when it comes out so this is a card that won't be in our decks unless it's picked up second hand. 

A nice little powerhouse I must say.  An indestructible 16/16 for potentially only 3 green mana.  I mean honestly what green deck worth its sleeves doesn't have 7+ creatures on the field before others can blink an eye. 

Wait a second.  Reread Convoke again.  You can pay off the colored mana also by tapping your creatures.  So by tapping ten creatures, at least three with green in their identity, you get this guy on the board for free. 

Quite the little nasty. 

Yeah I'm jealous of the people who can buy boxes just based off the promos from the last two expansions and now this.