Sister Hospitaller, Yannik, Scavenging Sentinel, and Bloodflow Connoisseur Combo

Sister Hospitaller, Yannik, Scavenging Sentinel, and Bloodflow Connoisseur

Here's how the cards Sister Hospitaller, Yannik, Scavenging Sentinel, and Bloodflow Connoisseur results in Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite lifegain triggers, Infinite lifegain, and Infinite +1/+1 counters

Sister Hospitaller

Yannik, Scavenging Sentinel

Bloodflow Connoisseur

Prerequisites

Sister Hospitaller in hand
Yannik, Scavenging Sentinel in the graveyard
Bloodflow Connoisseur on the battlefield
available

Steps

Cast Sister Hospitaller by paying
When Sister Hospitaller enters, it triggers, returning Yannik from your graveyard to the battlefield and causing you to gain life equal to its mana value
When Yannik enters, it triggers, exiling Sister Hospitaller until Yannik leaves the battlefield and putting three +1/+1 counters among any number of creature(s)
Activate Bloodflow Connoisseur by sacrificing Yannik
When Yannik leaves the battlefield, Sister Hospitaller is returned from exile to the battlefield
Repeat from step 2
Resolve all Bloodflow Connoisseur abilities