Based on that alone, Ruinous Intrusion will be in consideration for removal when brewing, and the +1/+1 counters effect will push it to the top of the list for decks that care for counter synergies
(This includes manifest, disguise, cloak, morph, and a few older effects that turn cards face down.) Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield
Toxic doesn't help if the creature deals combat damage to another creature or a planeswalker
Efficient top deck tutors like Vampiric Tutor are also missing but would, unquestionably, be in a Bracket 5 version of this deck
Theres also not a lot of Naturalize effects in the format, so this is even stronger than usual
Promos, Alternate Art, and More When looking at the alt arts available that are worth pulling, the serialized Eldrazi Titans need mentioning