Neyali is a commander that cares about tokens, so you should aim to go wide with cards like Triplicate Spirits or planeswalkers that make tokens
Let me repeat that, because the number is utterly absurd
In this spot, you should usually name Manamorphose with your Meddling Mage to make it very unlikely that Thing in the Ice transforms next turn
If that creature goes unblocked in combat, it deals 5 damage directly to the opponent, who subtracts that number from their total life
I don't think this ever is really worth it since most opponents will just play around it when it's already on board, and tucking a creature once seems a bit meh
If an opponent is trying to overwhelm us in the creature game, we can use Theoretical Duplication to keep the pace