If you roll a die for any other reason (to simulate a coin flip, to choose pizza toppings, to create alternate timelines), that roll doesn't count
Even better, it easily it transforms into Cecil, Redeemed Paladina 4/4 lifelinker that gives your other attacking creatures indestructible whenever it swings
The five mythic Dragons and Tiamat from Adventures in the Forgotten Realms started it, and the more recent combinations of Dragon goodness in Battle for Baldurs Gate that included Miirym, Sentinel Wyrm has really pushed it up lately
Copying an Army usually creates another 0/0 Army token that dies right away due to state-based actions
/d/e/1FAIpQLSfrdzKX_jHLmv2SfhEQsiJv
Transforming a Valki or Will/Rowan will kill the other side instantly, for example, since it needs to enter to receive its starting loyalty counters