Watch as You Decay

Deck focus is on Rolant, Iron Tyrant, but Icaria, First Reaper and several options in market are perfectly viable finishers.

Bubble Shield and Back for More: Offers the protection we need for finishers. Bubble Shield is stupidly cheap for a "negate removal or transform spell". Back for More is just disgusting when it happens but requires setup due to cost.

Annihilate, Defile: Cheap, fast speed removal which can lead to some fantastic exchanges when opponent isn't expecting Rolant to beef up or to see a deadly flier drop to block.

Devour: Protects against Turn to Seed, but mainly there for additional card draw since we have lots of Corrupted units.

Blightmoth and Unfamiliar Interloper: Good sacrifice fodder to the devour as mentioned above or to Siphoner Paladin. Blightmoth helps against aggression and interloper helps smooth influence.

Petition: Consider either removing from deck entirely or replacing with Beseech the Throne. It's been good for drawing Cylix which most likely gets us treasure trove as well.