Gun-Shu, Lord of the 1st Clan

Shasi: Summon a creature from your library for no cost, heal 2 (If this creature destroys another creature, it activates the first part of this ability. Further kills activate the second part.)
When Gun-Shu is declared as an attacker, you may tap any number of Human creatures to grant Gun-Shu +1/+0 for each of them until end of turn.
"The 12 Clans shall become lords onto themselves. I will lead them to this glory" - Edict of the 1st Clan