Phasebeast, Rare, 22r
Durable. Enduring (10). Siege.
Attack 30
If round is divisible by 5, the next card will be a common not from your deck.
Unfortunately, the effect of drawing a Common to break the chain would never occur. Since the card has the Durable keyword, it will still draw itself again. (Keyword effects occur after card effects and always go last.)
To get around this, you have to remove Durable and add "Else draw self" to the end of the text.