Arcee, Sharpshooter is a 2/2 creature with first strike, and you can pay one generic mana to remove any number of +1/+1 counters from it to deal that much damage to a creature
That's not a possibility with Amalia as your commander, but lifegain usually comes in multiple small triggers, so it's not inconceivable to grow Amalia in Commander either
It might seem simple, but youll find quite quickly in a match that rules can be taken very differently between two players
Then most of your creatures are tapping naturally
Jeering Instigator is a solid morph creature that is bound to lead to some sweet blowouts in a creature-heavy environment, but the morph creature that really has my attention is Ashcloud Phoenix
A 1/2 that costs two mana, Tifa comes with Trample and a landfall ability that doubles her power until the end of turn whenever you play a mana