{6}, {T}, Sacrifice Boom Box: Destroy up to one target artifact, up to one target creature, and up to one target land.

Flash Ward {2} Probing Telepathy — Whenever a creature entering the battlefield under an opponent's control causes a triggered ability of that creature to trigger, you may copy that ability. You may choose new targets for the copy.

Flying When Harrier Strix enters the battlefield, tap target permanent. {2}{U}: Draw a card, then discard a card.

+1: Scry 1, then draw a card. −2: Return target creature to its owner's hand. −8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell."

Spree (Choose one or more additional costs.) + {3} — Create a 2/2 white Spirit creature token with flying. + {1} — Counter target spell unless its controller pays {2}.

({T}: Add {U}.) Moonring Island enters the battlefield tapped. {U}, {T}: Look at the top card of target player's library. Activate only if you control two or more blue permanents.

Landfall — Whenever a land enters the battlefield under your control, equipped creature gets +2/+2 until end of turn. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Changeling (This card is every creature type.) {T}: Target creature gains all creature types until end of turn. {T}: Target creature loses all creature types until end of turn.

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

{T}: Add {C}{C}.

Counter target spell.

Spree (Choose one or more additional costs.) + {2} — Exchange control of two target creatures. + {1} — Exchange control of two target artifacts. + {1} — Exchange control of two target enchantments.

Search target opponent's library for an artifact card and put that card onto the battlefield under your control. Then that player shuffles.

When Corridor Monitor enters the battlefield, untap target artifact or creature you control.