Chalice of the Void

This artifact enters with X charge counters on it.
Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell.

Damping Matrix

Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.

Hum of the Radix

Each artifact spell costs {1} more to cast for each artifact its controller controls.

Collector Ouphe

Activated abilities of artifacts can't be activated.

It That Betrays

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)
Whenever an opponent sacrifices a nontoken permanent, put that card onto the battlefield under your control.

Root Maze

Rhonas's Monument

Green creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, target creature you control gets +2/+2 and gains trample until end of turn.

Thorn of Amethyst

Noncreature spells cost {1} more to cast.

God-Eternal Rhonas

Deathtouch
When God-Eternal Rhonas enters, double the power of each other creature you control until end of turn. Those creatures gain vigilance until end of turn.
When God-Eternal Rhonas dies or is put into exile from the battlefield, you may put it into its owner's library third from the top.

Manglehorn

When this creature enters, you may destroy target artifact.
Artifacts your opponents control enter tapped.