Vex

Paws and Crab can conquer and hold empty fields at zero Might. Switcheroo can turn either into the larger combatant by swapping its current Might with another unit at the same battlefield for the turn. That is not a kill spell: the units still need to fight, and the opponent can respond. Boots of Swiftness gives its bearer +2 Might as well as Ganking, so it also gives these small bodies a job without requiring a large enemy to borrow Might from. Keep track of what remains after a temporary boost ends.

Hide Warrior on an earlier turn, then play it from face down to empower something here. That can give Paws its seven-Might bonus without paying seven Energy, or trigger Kharox without paying his six Energy and two Chaos Power activation. Kharox burns three cards from the chosen opponent, then can play a unit from anywhere in that opponent's trash while ignoring its base cost. Warrior disempowers the chosen card at end of turn. The unit Kharox played stays, but Paws loses the bonus. A damaged Paws can die when that bonus disappears, before end-of-turn healing, so this is not a promise of a seven-Might defender next turn.

Heron needs to be at a battlefield when your first card-play trigger happens. Once its ability resolves, the next card you play that turn costs two less Energy and two less Power. Discipline can be the first card before a discounted Switcheroo or Rebuke. A counter or another cheap spell can consume the discount before the intended follow-up. Bringing Heron out of base after playing the first card does not create the missed trigger. The discount pays for a card, not an Equip or Empower activation.