LTR takes things a step further with special serialized poster cards only found in LotR Special Edition collector boosters, part of a special release from the end of 2023
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You can then tap it and remove it the counter on it to add the exact amount of mana you spent to attach the counter and card in the first place, and then that mana can only be used to cast the card attached to Ice Cauldron
If a creature is supposed to be overpowering and has to be played to be competitive, it had better actually be game ending in all contexts rather than just above average or a good rate
Thanks to this, theres little reason that you cant include all the cards we covered today, since they all fit within a Naya deck
Any of these spells, when timed correctly, can single handedly win a game for Coven Counters