When this creature enters, choose one —
• Repair — Return target card with mana value 4 or greater from your graveyard to your hand.
• Impound — Exile target artifact or enchantment.

Deathtouch
Skip your draw step.
At the beginning of your upkeep, if you have fewer than seven cards in hand, draw cards equal to the difference.

Destroy target creature. A creature destroyed this way can't be regenerated.
Overload

Destroy all creatures. They can't be regenerated.

Destroy all creatures with no counters on them.

Flying, deathtouch
Whenever Damocles Base deals combat damage to a player, that player faces a villainous choice — They sacrifice a nontoken creature of their choice, or they lose 2 life and you draw two cards.
Crew 3

Target player mills four cards.
Splice onto Arcane

Creatures your opponents control get -1/-0.

A player who controls more permanents than each other player can't play lands or cast artifact, creature, or enchantment spells. That player may sacrifice a permanent of their choice for that player to ignore this effect until end of turn.

Players can't untap more than one artifact during their untap steps.

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

If a land is tapped for two or more mana, it produces instead of any other type and amount.
Each spell a player casts costs more to cast for each other spell that player has cast this turn.

Noncreature, non-Equipment artifacts you control are Equipment in addition to their other types and have "Equipped creature gets +1/+0" and equip .
Doctor's companion (You can have two commanders if the other is the Doctor.)

Whenever a Reveler attacks, Dance of Flame deals 1 damage to each player.

When this enchantment enters, create a token that's a copy of target nontoken creature.
When this enchantment leaves the battlefield, exile the token.
When the token leaves the battlefield, sacrifice this enchantment.
At the beginning of your upkeep, sacrifice this enchantment unless you pay .

As long as five or more Revelers are on the battlefield, all Revelers have haste and attack each turn if able.

Creatures you control get +1/+0 and gain fear until end of turn.

Enchant creature card in a graveyard
When this Aura enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with this Aura." Put enchanted creature card onto the battlefield tapped under your control and attach this Aura to it. When this Aura leaves the battlefield, that creature's controller sacrifices it.
Enchanted creature gets +1/+1 and doesn't untap during its controller's untap step.
At the beginning of the upkeep of enchanted creature's controller, that player may pay . If the player does, untap that creature.

Until end of turn, target creature you control becomes a blue Dragon Illusion with base power and toughness 4/4, loses all abilities, and gains flying.

Spree (Choose one or more additional costs.)
+ — Search your library for a basic land card or a Desert card, put it onto the battlefield, then shuffle.
+ — Create an X/X green Elemental creature token, where X is the number of lands you control.

When you set this scheme in motion, each opponent reveals cards from the top of their library until he or she reveals a creature card. Choose one of the revealed creature cards and put it onto the battlefield under your control. Put all other cards revealed this way into their owners' graveyards.

Shuffle your library. As many times as you choose, you may exile the top card of your library. If the total mana value of the cards exiled this way is 13 or less, you may cast any number of spells from among those cards without paying their mana costs.

Create two 1/1 red Devil creature tokens. They have "When this token dies, it deals 1 damage to any target."

Job select
Equipped creature gets +2/+2, has lifelink and "Other commanders you control get +2/+2 and have lifelink," and is a Performer in addition to its other types.
Krishna — Equip

Whenever you cast a creature spell, put X +1/+1 counters on target creature you control, where X is that spell's mana value.
Landfall — Whenever a land you control enters, create a 2/2 green Bear creature token.

Equipped creature gets +2/+1.
When equipped creature dies, you may have this Equipment become a 2/1 Construct artifact creature with flying and ward . If you do, it isn't an Equipment.
Equip

This creature can't attack unless defending player controls an Island.
When you control no Islands, sacrifice this creature.