Ven the Warrior

: At least one colored mana must be used to summon Ven, who takes on colors used to summon him. At 10 loyalty flip Ven, only do so as a sorcery.
+1: When a target attacks but before assigning blockers you can activate this ability to tap target creature
-5: Deal damage to target equal to the number of lands in Ven's colors. Tap all lands in Ven's colors