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.
![Day of the Dragons [Commander 2015]](http://tothetablebgc.myshopify.com/cdn/shop/files/33aac116-e138-404d-a3c3-95a8b5d9d22f.png?v=1776620850&width=1445)
