Mr. Garvey, Chord Caller

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Instant and sorcery spells you cast have convoke. (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

Once on each of your turns you may pay {w}{u}{r} as you cast a spell. If you do, that spell has demonstrate. (When you cast this spell, you may copy it. If you do, choose an opponent to a