Nathari, God of Air

As an additional cost to cast Nathari, God of Air, you may pay 6 life; if you don't, sacrifice all lands you control.

This spell can't be countered.

Haste, Flying, Trample

Whenever a land enters the battlefield, that lands controller may sacrifice it. If they do, exile Nathari, God of the Sky.

Worship is a chain; the more fervent the devotion, the heavier the shackles.