Radiation

When Radiation enters the battlefield, create 2
Tunnels. Place 2 tokens on Radiation. Remove
one at the beginning of your upkeep. When there
are no more tokens, remove Radiation.
As long as Radiation is on the battlefield you may sacrifice lands and replace them with Tunnels.
As long as Radiation is on the battlefield you may remove 2 tokens instead of one from all Tunnels
at the beginning of your upkeep.