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This blue instant has lots of potential in decks revolving around counters

Urgent Tuning X TRAP During the Battle Phase: Immediately after this effect resolves, Synchro Summon 1 Synchro Monster using monsters you control

It's a strong choice for basically any Black deck, but it's a staple in Rogue Tribal

Key Combos Elsha + Senseis Divining Top + Reducer Requirements : [[Elsha of the Infinite]], [[Senseis Divining Top]], [[Helm of Awakening]], [[Birgi, God of Storytelling]], or [[Displacer Kitten]] and a mana rock

Thassa, God of Merfolk

In Commander especially, its a cornerstone of any deck willing to dip dangerously low on life points to win on the spot