Kartros' Spellbook of Summons

Collecting Ingridients—If Kartros' Spellbook is your commander, choose two colors before the game begins. This card is the choosen colors.

{x}{t}: reveal the first card of your library. If it's a creature with mana value X or less you may cast it without paying its mana cost. Else put a Fail counter on Kartros' Spellbook of Summons.

"Uff... I should have used more frog legs" - Kartros