Pay {0} to activate Outrider en-Kor, targeting Task Force.
Task Force triggers, giving itself +0/+3 untill end of turn.
Repeat steps 1-2 untill Task Force has infinite toughness.
Tap the land equiped with Animal Boneyard, sacrificing Task Force and gaining life equal to its toughness.

Infinite lifegain

Task Force

Animal Boneyard

Outrider en-Kor

Activate Nomads en-Kor by paying {0}, targeting Daru Spiritualist.
Daru Spiritualist triggers, giving it +0/+2 until end of turn.
Repeat an arbitrarily large number of times.
Activate the land with Animal Boneyard attached by tapping it and sacrificing Daru Spiritualist, causing you to gain life equal to Daru Spiritualist's toughness.

Combos with "Animal Boneyard"