Wall of Vipers

Enchant land Enchanted land has "T: Counter target spell unless its controller pays 1."

When this creature enters, each player sacrifices all lands they control except for three.

This land enters tapped. T: Add C. 2, T, Sacrifice this land: Tap two target lands.

Prevent all damage that would be dealt to this creature. 3: Until end of turn, this creature loses "Prevent all damage that would be dealt to this creature." Any player may activate this ability.

Flying At the beginning of your end step, tap all lands you control.

Flying When this creature attacks or blocks, return it to its owner's hand at end of combat. (Return it only if it's on the battlefield.)

Each player creates a green Elephant creature token. Those creatures have "This token's power and toughness are each equal to the number of creature cards in its controller's graveyard."

This creature gets +2/+1 as long as you control no untapped lands.