隔(へだ)てる歩(ほ)哨(しょう)

Starting intensity 2

When this creature enters, it deals X damage to any target and you gain X life, where X is this creature's intensity. Then it intensifies.

At the beginning of your end step, exile this creature. At the beginning of your next upkeep, return it to the battlefield under its owner's control. It gains haste.