"OP08-118 Silvers Rayleigh" can individually K.O
Unless your deck is packed full of high-cost spells, youre a lot more likely to be able to get back multiple different cards than you are to completely whiff even if you dont roll particularly well
That means your best creatures can trigger again, avoid removal, reset counters, or temporarily remove opposing threats from combat
If the result is 6, increase this card's original ATK and DEF by that card's ATK (permanently), also this card gains that card's effect until the End Phase
Its not quite Mind Rot, but it gets either two lands or a spell, which is a bit better than your opponent discarding an excess land
If you opened 2 Alvisses you don't have to mill your final Alviss