Kel, Playful Athlete

+1: Deal 1 damage to target creature. That creature gets +4/+0 until end of turn
-X: Deal X damage to target creature. If you controlled that creature, add X mana in any combination of blue or red
-6: You get an emblem with "Whenever you cast an instant or a sorcery spell, deal damage equal to its converted mana cost to any target"