As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.

Equipped creature gets +0/+3 and has vigilance. (Attacking doesn't cause it to tap.)
Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Target creature gains haste until end of turn.

Flash
Deathtouch

Whenever a player casts a white spell, you may gain 1 life.

Haste
Modular 2 (This creature enters the battlefield with two +1/+1 counters on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Target player reveals the top four cards of their library. You choose two of those cards and put them into that player's graveyard. Put the rest on top of their library in any order.

Put target artifact or creature card from a graveyard onto the battlefield under your control. Shuffle Beacon of Unrest into its owner's library.

Equipped creature has myriad. (Whenever it attacks, for each opponent other than defending player, you may create a token that's a copy of that creature that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
Equip

Affinity for artifacts (This spell costs less to cast for each artifact you control.)
Untap all artifacts.

Whenever a permanent is turned face up, Bonethorn Valesk deals 1 damage to any target.

Prevent the next 3 damage that would be dealt to any target this turn. You gain life equal to the damage prevented this way.
Splice onto Arcane (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Search your library for a Mercenary card, reveal that card, and put it into your hand. Then shuffle your library.

Whenever Cephalid Constable deals combat damage to a player, return up to that many target permanents that player controls to their owner's hand.

Flying
, Sacrifice a land: Draw a card.

Equipped creature gets +2/+2.
As long as equipped creature is legendary, it has hexproof. (It can't be the target of spells or abilities your opponents control.)
Equip

Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand.
: Add one mana of any of the exiled card's colors.

: The next time a green source of your choice would deal damage to you this turn, prevent that damage.

: Add .

: Add .
, : Add .