Sun Titan + Angelic Renewal + sacrifice outlet = infinite sacrifices and ETBs
How it works:
- Have Sun Titan, Angelic Renewal, and a sacrifice outlet on the batllefield
- Sacrifice Sun Titan, triggering Angelic Renewal's ability
- Sacrifice Angelic Renewal to its ability, returning Sun Titan to the battlefield
- Return Angelic Renewal to the battlefield using Sun Titan's ETB trigger
- Repeat