Skycat Sovereign's first ability applies only while it's on the battlefield.
17-04-2020
wotc
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Skycat Sovereign may become lethal if other creatures with flying you control leave the battlefield during that turn.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.