Matter-Changing Spirit

Shroud, Cumulative Upkeep—1 Life.
Claim—{w}{b}: Target Core-Forge land is now indestructible, produces an extra {2} when tapped
for mana, and has "Once per turn you may pay X
Life, look at the top one-third X cards (rounded
down) of target player's library. Put one into
your hand and the rest randomly on the bottom
of that player's library.". This effect is permanent
and cannot be changed while Matter-Changing
Spirit is in play.