force of will mtg card – Proxy Dominaria Remastered You may pay 1 life and exile a blue card from your hand rather than pay this spells mana cost Force of Will (EMA) Foil

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Id say a little high on costs for activation, but synergizes well with the commander if you have food tokens lying around

Wandering Archaic / Explore the Vastlands Both sides of Wandering Archaic can be helpful, but its definitely more powerful on its creature side

You can also shortcut Etratas win condition completely by using the other cards which place hit counters: Ravenloft Adventurer and Mari, the Killing Quill

Youre trying to do anything deceptive (dont)

Im not so sure that the elemental warlock can close the gap in relative power ceiling