Both paths through Tomb of Annihilation feature room effects which should cause a Sefris trigger from discarding or sacrificing creatures (including tokens), but if Sefris was already the reason we were venturing in the first place her once per turn stipulation means we cant take advantage
Obviously these may be a miss for your format for other reasons (power, archetype mismatch, rarity, don't run planeswalkers etc) but here's a few that I found interesting, divided by broad category rather than color: While I'm still not done reading Cosima, God of the Voyage (I'm on chapter 2, the language is a bit dense) these cards are ones I do like both sides of
Ive also seen a few players experiment with Shadow Rider Calyrex VMAX [Chilling Reign] in a Gardevoir ex deck because of the natural synergy of Energy acceleration and doing extra damage
You can build this Aurelia as a go-wide commander, but its usually a better inclusion in the 99 of a given deck, like Boros aggro commanders like Gisela, Blade of Goldnight and Aurelia, the Warleader
Red Shanks 1xOP09-001 4xOP01-006 2xOP01-013 4xST15-002 4xOP08-118 3xOP09-002 3xOP09-004 2xOP09-005 4xOP09-008 4xOP09-009 4xOP09-011 4xOP09-013 4xOP09-014 4xOP09-015 1xOP09-118 3xOP01-029 Red Shanks is a solid contender in OP09 meta, keeping up with the top meta decks like Blue Doflamingo