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The Synchro Monsters can then be returned to the Extra Deck when the opponent activates a card or effect to Special Summon "Yummy" monsters from the Graveyard, many of which gain disruptive bonus effects when they are Special Summoned by a Synchro Monster's effect

Demonic Tutor in the command zone is scary, even if it's 5 mana and demands a sacrifice

Planeswalkers offer just as much power

Fun fact: internally, we referred to this issue as the "Thalia Problem"

The problem comes with its summon condition, which will require good monster management for have a Fiend in both hand and field ready to be dumped when the opponent attacks, and expect in certain Duels the opponent might avoid attacking our monsters and prefer to use effects for clean our field