Deathrender + Heirloom Blade + Ashnod's Altar + Sin, Unending Cataclysm

Deathrender

Heirloom Blade

Ashnod's Altar

Sin, Unending Cataclysm

How it works

1. Activate Ashnod's Altar by sacrificing Sin, adding CC.
2. When Sin dies, it, Heirloom Blade and Deathrender trigger.
3. Resolve the Sin trigger, shuffling it into your library.
4. Resolve the Heirloom Blade trigger, causing you to reveal cards from the top of your library until you reveal a creature that shares a card type with Sin and put it into your hand
5. Resolve the Deathrender trigger, putting the creature from your hand onto the battlefield and attaching Deathrender to it.
6. Activate Heirloom Blade's equip ability by paying 1, attaching it to the creature.
7. Repeat.