Melek, Izzet Paragon

This creature doesn't untap during your untap step. Whenever you cast a nonred spell, untap this creature.

Equipped creature has ": Add one mana of any color." Equip

: This creature deals 1 damage to any target. Whenever you cast an instant or sorcery spell, you may untap this creature.

Flying White spells and black spells you cast cost less to cast.

White spells you cast cost less to cast.

: Tap target creature. Whenever you cast a white spell, you may untap this creature.

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.