Dice of malice

exile all nonbasic lands you control. all basic lands
you control become 1/1 creatures with X walker
where X is the type of land the card was.
The only way you gain mana is by rolling one of
five dice between d4, d6, d8, d10, or d12
at the beginning of upkeep, roll one die and gain
that much mana of any color. each die must be
used just once until all dice are used.