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By casting the front side of the card for its mana cost and fulfilling its required conditions, players can transform it to experience its alternate form

Perfect for trading, discovering new cards, and unleashing the magic of favorite Disney characters in exciting battles

Totally a thing

Filigree Sages + Power Artifact + artifact that taps for xU = infinite mana Beacon of Tomorrows + Planar Portal for infinite turns Beacon of Tomorrows + Manipulate Fate + Mirror of Fate = infinite turns Magus of the Future/Future Sight + Etherium Sculptor (or other mana reducers) + Sensei's Divining Top = draw your deck Deadeye Navigator + Palinchron /Great Whale/Peregrine Drake = infinite mana Cloud of Faeries + Deadeye Navigator + mana doubler, Sol land, or Karoo/bounce land = infinite mana / ETB Intruder Alarm + March of the Machines + Myr Turbine = infinite tokens Omen Machine + Teferi, Mage of Zhalfir = spell lockdown (cards in opponents hand are still playable) Grand Architect + Pili-Pala = infinite mana High Market + Nim Deathmantle + Peregrine Drake = infinite life gain Candelabra of Tawnos + Magosi, the Waterveil + Rings of Brighthearth /Deserted Temple = infinite turns

Basically I am looking for cards that are blue, instant, cost about four mana and are ways to get card advantage and/or perhaps card quality