Day of the Dragons

When Day of the Dragons enters the battlefield, exile all creatures you control. Then put that many 5/5 red Dragon creature tokens with flying onto the battlefield.When Day of the Dragons leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.

When this enchantment enters, exile all creatures you control. Then create that many 5/5 red Dragon creature tokens with flying.
When this enchantment leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.

When Day of the Dragons comes into play, remove all creatures you control from the game. Then put that many 5/5 red Dragon creature tokens with flying into play.
When Day of the Dragons leaves play, sacrifice all Dragons you control. Then return the removed cards to play under your control.

Kaldheim Commander

When Day of the Dragons enters the battlefield, exile all creatures you control. Then create that many 5/5 red Dragon creature tokens with flying.
When Day of the Dragons leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.