Too Close I Cannot Breathe

At the beginning of your precombat main phase,
each opponent loses X life and you gain X life,
where X is the number of Caves you control.

Whenever a land enters the battlefield under your control, put a coffin counter on target permanent. Permanents with coffin counters on them cannot
attack or block, and their activated abilities cannot
be triggered.

Too Close I Cannot Breathe can be your commander.