The obvious play pattern of swapping the textbox of, lets say a Crab, with Ulamog, the Ceaseless Hunger, but Id rather turn planeswalkers or artifacts into creatures and swap the planeswalkers ability with one of my creatures
You draw it up into an applicator bottle with a needle on the end, then squeeze a tiny bit out along the seam, and the solvent wicks through the joint and pulls everything together
Phyresis does it simply, transforming pingers like Syr Konrad, the Grim into potentially lethal threats
A lot of the Food-centric decks run a bunch of little guys as enablers so I could see this as a way to turn them into threats as well
In a twist, these Sagas even stick around after they hit their final phase, transforming into permanents with new effects