Mind Flayer, the Shadow - Arvinox, the Mind Flail - [Foil] Secret Lair Drop (SLD) FUT creatures can't block unless their

creatures can't block unless their controller pays {1} for each of those creatures

you may exile an instant card with mana value 2 or less from your hand

return all other tapped creatures to their owners' hands

"A good whack on the head usually has the same effect

Its controller gains 3 life

Mind Flayer, the Shadow - Arvinox, the Mind Flail - [Foil] Secret Lair Drop (SLD) FUT creatures can't block unless theirArvinox, the Mind Flail isn't a creature unless you control three or more permanents you don't own. At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells.