Magic: The Gathering - Avatar: The Last Airbender Collector Booster Pack New Stock Creatures can't attack you unless

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you

search your library and/or graveyard for a non-Human creature card with mana value X or less and put it onto the battlefield

or targeted by anything controlled by your opponents

As long as this creature has three or more +1/+1 counters on it

"The Mental Traveller"

Magic: The Gathering - Avatar: The Last Airbender Collector Booster Pack New Stock Creatures can't attack you unlessWATER. EARTH. FIRE. AIR MAGICWield the power of the elements as Avatar: The Last Airbender teams up with Magic: The Gathering! Climb atop a sky bison and travel from the walls of Ba Sing Se to the heart of the Fire Nation and restore balance to the worldor conquer it. Each Magic: The Gathering Avatar: The Last Airbender Collector Booster Pack contains 15 Magic: The Gathering cards, including: 5 cards of rarity Rare or higher 4 Uncommon 5 Common 1 Full