It doesn't target either, so Ice Dragon's Prison gets around almost every kind of protection in the game
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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)
So many of the cards that worked there will be just as good here
I acknowledge that its frustrating to have an effect that opponents cannot interact with, but (much like Partner ) Im (mostly) fine with it
Artifact - Equipment Color tag templates(None) Felidar Retreat Landfall Whenever a land you control enters, choose one Create a 2/2 white Cat Beast creature token