Also worth noting: Helm of the Host makes non-Legendary copies, so we can Equip it to Omnath, Locus of the Roil to trigger its enter-the-battlefield effect every turn
Split cards like Catch // Release can be cast as either half or both combined
Additionally, the clasp that keeps the case shut isnt very secure, and simply dropping it is likely enough for it to pop open and scatter the cards inside
As soon as Decimator Beetles ability resolves, state-based actions are checked, and the game sees that you have both counter types on your Servant, so one +1/+1 counter and one -1/-1 counter are removed at the same time (resulting in Servant dying)
Emrakul, the World Anew gains control of an opponent's creatures regardless if it resolves or not
While I think the formats advocates have chosen a very fun line, I think it is inherently flawed