Attune with Aether was an important part of Standard Marvel decks, providing early energy counters and land drops, and both Galvanic Discharge and Tune the Narrative could play a similar role but with even greater utility
C Common Melffy Puppy X EARTH Level 2 [ BeastEffect ] ATK 300 DEF 100 If your opponent Normal or Special Summons a monster(s) (except during the Damage Step), or if an opponent's monster targets this card for an attack: You can return this card to the hand, then you can Special Summon 1 Level 2 or lower Beast monster from your Deck, except "Melffy Puppy"
There are online marketplaces or stores where you can order Japanese card games, but be careful with your choice, you don't want to spend your precious money to receive fake cards or even never receive them at all because the sender doesn't know how to handle international customs controls properly
Events: Various events and tournaments often feature these cards, providing opportunities for fans to engage and compete
Lots of cheap creatures getting counters makes Simic counters payoffs like Simic Ascendancy, Mutational Advantage, and many others viable
