Henzie "Toolbox" Torre + Mortuary + Bloodflow Connoisseur

Henzie "Toolbox" Torre

Mortuary

Bloodflow Connoisseur

How it works

1. Cast the creature with MV>=4 for its blitz cost by paying 0.
2. Activate Bloodflow Connoisseur by sacrificing the creature.
3. When the creature dies, it and Mortuary trigger.
4. Resolve the Mortuary trigger, putting it from your graveyard on top of your library.
5. Resolve the creature's trigger, causing you to draw it from the top of your library.
6. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it.
7. Repeat.

This elegant loop centers around Henzie "Toolbox" Torre, whose cost-reduction ability allows you to cast qualifying creatures with a mana value of 4 or greater entirely for free once the commander tax has accumulated enough. When you feed that creature to Bloodflow Connoisseur's sacrifice ability, it triggers both its own blitz death draw and Mortuary's static replacement effect, which neatly tucks the creature right back onto the top of your library just in time to draw it. By repeating this cycle, you can endlessly churn through your deck while growing the Bloodflow Connoisseur to infinite size and triggering every possible enter-the-battlefield, leave-the-battlefield, and death effect your heart desires.