The Cloud Keeper

Flying, Ward-Return a land you control to your hand.
When The Cloud Keeper enters or attacks, each player
returns a land they control to its owner's hand. Put a
+1/+1 counter on The Cloud Keeper for each permanent returned this way.
{x}, Remove X +1/+1 counters from The Cloud Keeper:
The Cloud Keeper deals X damage to each creature
without flying and each player.