whenever you gain life draw a card mtg Rules Text: card, 46 cards Gain Life, Draw Cards Deck

OUT Skullcrack IN Rending Volley Destructive Revelry Watch out for Batterskull post-board

You cant play it from anywhere other than your graveyard, and thats kind of a problem

Atog Rarity: Common TYPE: Creature SUBTYPE: Atog CMC: 2 Mana cost: USD: $0.27 EUR: 0.22 TIX: 0.03 EDHREC RANK: 14718 (1/2) Sacrifice an artifact: This creature gets +2/+2 until end of turn

One quick PSA before we dive in: cards with Firebend (like [[Azula, Cunning Usurper]]) may show red mana symbols in reminder text, but they do not count as red for colour identity

All around, Id go with Firkraag and use the other options as ways to strengthen what youre doing