Mirrorweave

Each other creature becomes a copy of target nonlegendary creature until end of turn.

Natural Affinity

All lands become 2/2 creatures until end of turn. They're still lands.

Splinter

Exile target artifact. Search its controller's graveyard, hand, and library for all cards with the same name as that artifact and exile them. Then that player shuffles.

Darkness Descends

Myr Landshaper

{T}: Target land becomes an artifact in addition to its other types until end of turn.

Drooling Ogre

Whenever a player casts an artifact spell, that player gains control of this creature. (This effect lasts indefinitely.)

Fractured Identity

Exile target nonland permanent. Each player other than its controller creates a token that's a copy of it.

Painter's Servant

As this creature enters, choose a color.
All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.

Grindstone

{3}, {T}: Target player mills two cards. If two cards that share a color were milled this way, repeat this process.

Magnetic Theft

Attach target Equipment to target creature. (Control of the Equipment doesn't change.)

Alabaster Leech

White spells you cast cost {W} more to cast.

Necroskitter

Wither (This deals damage to creatures in the form of -1/-1 counters.)
Whenever a creature an opponent controls with a -1/-1 counter on it dies, you may return that card to the battlefield under your control.

Eradicate

Exile target nonblack creature. Search its controller's graveyard, hand, and library for all cards with the same name as that creature and exile them. Then that player shuffles.

Spy Kit

Equipped creature gets +1/+1 and has all names of nonlegendary creature cards in addition to its name.
Equip {2}

Mishra's Bauble

{T}, Sacrifice this artifact: Look at the top card of target player's library. Draw a card at the beginning of the next turn's upkeep.