Crow Lord's Influence

Enchant land
Enchanted land has "{t}: add {u}, {b}, or {r}"
Enchanted land has "When you use mana
this land generates to cast an instant or sorcery
spell, creatures you control gain either
indestructible or lifelink (your choice) until the
end of the turn"
"The crows keep us safe. Respect them on patrol"
-- Erik Stonefeller, Patrol Captain