The bounty on its head is as old as Skysail, but no one has ever tried to collect.

Skycat Sovereign

Flying
This creature gets +1/+1 for each other creature you control with flying.
{2}{W}{U}: Create a 1/1 white Cat Bird creature token with flying.

Starter Commander Decks

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Ikoria: Lair of Behemoths

Ikoria: Lair of Behemoths Promos

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.

Skycat Sovereign's first ability applies only while it's on the battlefield.