Whenever you cast a spell with mana value 4 or greater, put two +1/+1 counters on this creature.

Enchant creature
When Possibility Prison enters, if there are six or more cards in any player's graveyard, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

When Power Source enters, draw two cards, then discard two cards.
{1}, {T}: Add one mana of any color. This ability costs {1} less to activate if you control three or more artifacts named Power Source.

When this Rift enters or is traversed, target creature gets +2/+0 until end of turn and can't be blocked this turn.
Traverse 4

When Practicing Guru enters, create a Berry token.
Practicing Guru gets +1/+1 as long as you've sacrificed a Berry that was attached to it this turn.
Sacrifice a Berry attached to Practicing Guru: It gains indestructible until end of turn.

Lifelink
If one or more -1/-1 counters would be put on a creature an opponent controls, that many plus one -1/-1 counters are put on it instead.

Prevent all damage that would be dealt to you this turn.

Target creature you control gains double strike until end of turn. That creature also gains trample until end of turn if you control a creature with power 4 or greater.

When Presence of the First Dream enters, return up to one target creature to its owner's hand.
At the beginning of each end step, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, draw a card.

Tap target creature.
Draw a card.

Flying, haste
Landfall — Whenever a land you control enters, put a +1/+1 counter on Pressuring Ghoul unless any opponent discards a card.

Defender
Whenever a land or Treasure you control enters, put a hatching counter on Primal Egg.
Remove three hatching counters from Primal Egg and sacrifice it: Create a 4/4 red Dragon creature token with flying.

Create a 2/2 green Ox creature token. You gain 2 life.
Invoke {4}{G}{G}

As this artifact enters, choose mourning, oblation, or prayer.
• Mourning — Players can't discard cards to cast spells or activate abilities.
• Oblation — Players can't sacrifice nonland permanents to cast spells or activate abilities.
• Prayer — Players can't pay life to cast spells or activate abilities.

Favored
At the beginning of your end step, put a +1/+1 counter on your Champion.

Defender
{1}, {T}: Add one mana of any color.

When Prismatic Remnant enters, scry 2.

{VP}{VP}{VP}: Pristine Star gains double strike until end of turn.

As Prodigious Hater enters, look at an opponent's hand, then choose a nonland card name.
Whenever an opponent casts a spell with the chosen name, Prodigious Hater deals 3 damage to that player.

Whenever you cast a spell, if mana from an artifact source was spent to cast it, you may pay 1 life. If you do, draw a card. Do this only once each turn.

Menace
Error spells you cast cost {X} less to cast, where X is the total amount of life your opponents have lost this turn.

When Projects Overseer enters, surveil 2.

When this artifact enters, draw a card.
{1}, {T}: Add one mana of any color.

As this creature enters, choose a creature type.
This creature is the chosen creature type in addition to its other types.
{2}: This creature becomes a copy of another target creature you control of the chosen type until end of turn.

Flash
When Protective Detective enters, another target creature you control gets +2/+2 until end of turn.
Undercover