Natural Affinity + Darkness Descends + Necroskitter

Natural Affinity

Darkness Descends

Necroskitter

How it works

1. Cast Natural Affinity by paying 2, causing all lands to become 2/2 creatures in addition to their other types.
2. Cast Darkness Descends by paying 2, putting two -1/-1 counters on each creature.
3. Each land dies as a state-based action due to having 0 toughness, as well as each creature that had toughness 2 or less.
4. Necroskitter triggers for each creature and land your opponents controlled that died, returning them from their graveyards onto the battlefield under your control.