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Counter A way to keep track of how many of something is placed onto a face-up card

Power Nullifier: One of their more common support abilities allows them to nullify the effects of opposing monster cards, sometimes as a direct effect, sometimes as a potential bonus effect

Jellicent/Gardevoir

Damage and effects that say "destroy" don't destroy this creature.) Equip abilities you activate that target Cloud cost less to activate

Activate Ferrijits effect to Special Summon Celestine Wagtail, which will allow you to add Lyrilusc - Bird Call from your deck to your hand

There are some cards that are guaranteed to have a massive impact on the format and have already been talked about at length (Counterspell, Abundant Harvest, etc)