Whenever a creature enters the battlefield under your control, put a +1/+1 counter on each creature you control.

When Cathodion dies, add .

: Choose any number of target creatures. Each of those creatures gains persist until end of turn. (When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Creatures with power less than Champion of Lambholt's power can't block creatures you control.
Whenever another creature enters the battlefield under your control, put a +1/+1 counter on Champion of Lambholt.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

As Citadel Siege enters the battlefield, choose Khans or Dragons.
• Khans — At the beginning of combat on your turn, put two +1/+1 counters on target creature you control.
• Dragons — At the beginning of combat on each opponent's turn, tap target creature that player controls.

Coldsteel Heart enters the battlefield tapped.
As Coldsteel Heart enters the battlefield, choose a color.
: Add one mana of the chosen color.

: Add one mana of any color in your commander's color identity.

: Add one mana of any color in your commander's color identity.
Sacrifice Commander's Sphere: Draw a card.

If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead.

Changeling (This card is every creature type.)
Exile target creature. Its controller creates a 1/1 colorless Shapeshifter creature token with changeling.

Converge — Crystalline Crawler enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.
Remove a +1/+1 counter from Crystalline Crawler: Add one mana of any color.
: Put a +1/+1 counter on Crystalline Crawler.

Search your library for up to two basic land cards, reveal those cards, and put one onto the battlefield tapped and the other into your hand. Then shuffle your library.

Enchant player
Creatures enchanted player controls attack each combat if able.

Custodi Soulbinders enters the battlefield with X +1/+1 counters on it, where X is the number of other creatures on the battlefield.
, Remove a +1/+1 counter from Custodi Soulbinders: Create a 1/1 white Spirit creature token with flying.

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.

[+2]: Discard up to two cards, then draw that many cards.
[−2]: Sacrifice an artifact. If you do, return target artifact card from your graveyard to the battlefield.
[−10]: You get an emblem with "Whenever an artifact is put into your graveyard from the battlefield, return that card to the battlefield at the beginning of the next end step."
Daretti, Scrap Savant can be your commander.

Flying
When Dark Hatchling enters the battlefield, destroy target nonblack creature. It can't be regenerated.

Indestructible
: Add .

Indestructible
: Add one mana of any color.