spirit cards mtg of Resilience [SGL-MTG-SOC2-085-ENN] if Nether Spirit is the only creature card in your graveyard Indebted Spirit

Ive only tried it a couple times from TCGplayer

It triggers if a blocking creature has been declared as a blocker

When you sacrifice another nonland permanent during your turn, you may put a number of +1/+1 counters equal to Szarel's power on another target creature

This actually came as a surprise to me, as conditional mana ramp that adds extra hoops to jump through beyond having fewer lands than your opponent is almost always unplayable, but when that hoop is take this creature off the battlefield, and the reward is both ramp and potentially filling your hand with any land with the Plains subtype, the results are surprisingly effective

And its among the best get out of jail cards when you're caught between a rock and a hard place: You draw a full new hand, and after you cast anything useful from it you get your old hand back