Whenever another nontoken creature you control enters, if it wasn't cast, create a token that's a copy of that creature, except it's a 0/1 white Illusion.
, Sacrifice five Illusions: Exile target nonland permanent.
Preston turns every nontoken creature that enters without being cast into a free 0/1 Illusion copy, so you abuse blink, reanimation, and token-making effects to flood the board and trigger powerful ETBs twice. Early turns develop ramp and value creatures, then you loop blink effects to bank Illusions and grind out card/board advantage. Eventually you sacrifice five Illusions repeatedly to exile any troublesome permanent or assemble a combo finish.
Generates free creature tokens (and doubled ETB triggers) from any blink, reanimate, or token-copy effect
Built-in repeatable removal that exiles ANY nonland permanent, rare in mono-white
Excellent with cheap, high-value ETB creatures and flicker engines
Self-sufficient engine that doesn't need to attack to win
Mono-white card draw and ramp are limited, so it can stall on resources
The Illusion copies are fragile 0/1s vulnerable to board wipes and pingers
Relies on the commander surviving; without Preston the engine stops
Combo lines can be mana- and piece-intensive to assemble