The Reality Stone

Infinity stone
Each land you control has "{t} Add two mana of
any color combination to your mana pool"
{x}{t} Change the permanent type of each of up
to X permanents to a different type until end
of turn (you may choose a different type
each time), they lose all other types and
abilities until end of turn.
{6}{p/r} : exchange control of two permanents
that share a type