Thanks to this effect, Once Upon a Time effectively dramatically expands your opening hand, which helps to enable all manner of early-game synergies
Phantom Nishoba Loxodon Hierarch Nazahn, Revered Bladesmith Qasali Pridemage Saffi Eriksdotter Mystic Enforcer Knight of the Reliquary Fleetfoot Panther Gaddock Teeg Voice of Resurgence Rhys the Redeemed Tolsimir Wolfblood Wilt-Leaf Liege Sigarda, Host of Herons Sigarda, Heron's Grace Selvala, Explorer Returned Selesnya Guildmage Renegade Rallier Armada Wurm Captain Sisay Centaur Healer Dauntless Escort Dromoka, the Eternal Dragonlord Dromoka Enlisted Wurm Fleecemane Lion Karametra, God of Harvests Kitchen Finks Loxodon Smiter Mirri, Weatherlight Duelist Novablast Wurm Holy crap
To help, well list out some of the better options for players looking to dip their toes into Rat typal in Commander
Turn 3 : During your untap step before you untap, Old Fogey phases in
Even the strongest top loader wont protect a card fully if its stored improperly