Place 1 "Crystal Beast" monster from your Deck in your Spell & Trap Card Zone, face-up, as a Continuous Spell Card
During Urzas Saga design, we toyed around with different cycling costs but realized that the mechanic was rich enough that only a single fixed cost (which obviously turned out to be 2) was necessary
The goal is to get rid of all of your cards first
I love the silliness of this because you can exchange a Llanowar Elves textbox with an Ulamogs, or even better, with someones commander ability
Special Summon it, then you can equip 1 "Therion" monster from your hand or GY to it
Ultimately, the team agreed that phasing could still have a positive role to play, so long as the players had more control over when things phased out