Declare Jumbo Cactuar as an attacker, triggering its ability, giving it +9999/+0 until end of turn.
Cast Predator's Rapport by paying {2}{G}, targeting Jumbo Cactuar and causing you to gain 10,007 life.

Near-infinite lifegain

Jumbo Cactuar

Predator's Rapport

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.
Cast Predator's Rapport targeting Task Force, gaining life equal to its toughness.

Combos with "Predator's Rapport"