Anti-Mage

Whenever Anti-Mage attacks, he gets +X/+0
until end of turn, where X is the number of
tapped lands the defending player controls.
Whenever Anti-Mage deals combat damage to a player, that player taps that many lands.
{1}{u}: Remove Anti-Mage from combat.
{u}{u/b}: Change the target of target spell that is targetting Anti-Mage.