Arcbound Reclaimer + Showdown of the Skalds + Delif's Cone + Experimental Frenzy

Arcbound Reclaimer

Showdown of the Skalds

Delif's Cone

Experimental Frenzy

How it works

1. Cast Delif's Cone from the top of your library by paying 0
2. Showdown of the Skalds triggers, putting a +1/+1 counter on Arcbound Reclaimer.
3. Activate Delif's Cone by tapping and sacrificing it.
4. Activate Arcbound Reclaimer by removing a +1/+1 counter from it, putting Delif's Cone from your graveyard onto the top of your library.
5. Repeat.

This ingenious loop turns the top of your library into an endless engine by leveraging Experimental Frenzy to cast Delif's Cone directly from the library for zero mana. Each time you cast the Cone, Showdown of the Skalds triggers its second and third chapters to place a +1/+1 counter onto Arcbound Reclaimer. You can then sacrifice the newly cast Delif's Cone and use the counter generated by Showdown of the Skalds to fuel Arcbound Reclaimer's ability, placing the Cone right back on top of your library to repeat the process.