Portal Guardian

Defender, flying
Painborn (Each 1 life you pay while casting this spell pays for {1}. This creature enters the battlefield with a -1/-1 counter on it for each 1 life paid this way.)
Prevent all combat damage that would be dealt to portal guardian.
When portal guardian blocks a creature remove a -1/-1 counter from portal guardian then return target permanent to its owners hand, that player loses 1 life.