Arcbound Reclaimer + Showdown of the Skalds + Tormod's Crypt + 1 more

Cast Tormod's Crypt either from your hand or from the top of your library by paying

Showdown of the Skalds triggers, putting a +1/+1 counter on Arcbound Reclaimer.

Activate Tormod's Crypt by tapping and sacrificing it.

Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Tormod's Crypt from your graveyard onto the top of your library.

Repeat.