Staff of Zegon

{3}, {T}: Target creature gets -2/-0 until end of turn.

Righteous Charge

Creatures you control get +2/+2 until end of turn.

Tablet of Epityr

Whenever an artifact you control is put into a graveyard from the battlefield, you may pay {1}. If you do, you gain 1 life.

Tawnos's Wand

{2}, {T}: Target creature with power 2 or less can't be blocked this turn.

Tawnos's Weaponry

You may choose not to untap this artifact during your untap step.
{2}, {T}: Target creature gets +1/+1 for as long as this artifact remains tapped.

Tetravus

Flying
This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from this creature. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This token can't be enchanted."
At the beginning of your upkeep, you may exile any number of tokens created with this creature. If you do, put that many +1/+1 counters on this creature.

Time Vault

This artifact enters tapped.
This artifact doesn't untap during your untap step.
If you would begin your turn while this artifact is tapped, you may skip that turn instead. If you do, untap this artifact.
{T}: Take an extra turn after this one.

Triassic Egg

{3}, {T}: Put a hatchling counter on this artifact.
Sacrifice this artifact: Choose one. Activate only if there are two or more hatchling counters on this artifact.
• You may put a creature card from your hand onto the battlefield.
• Return target creature card from your graveyard to the battlefield.

Urza's Chalice

Whenever a player casts an artifact spell, you may pay {1}. If you do, you gain 1 life.

Urza's Miter

Whenever an artifact you control is put into a graveyard from the battlefield, if it wasn't sacrificed, you may pay {3}. If you do, draw a card.

Vibrating Sphere

During your turn, creatures you control get +2/+0.
During turns other than yours, creatures you control get -0/-2.

Masters Edition IV