Level up {2}{B}
[level 1-2] Other creatures get -1/-1.
[level 3+] Creatures your opponents control get -1/-1.

Decayed
You may cast The Venerable Veteran from your graveyard.

Menace
Cybersoul {3}{B}

Whenever you cast a spell, if mana from an artifact source was spent to cast it, you may copy that spell, and you may choose new targets for the copy. Do this only once each turn.

Menace
Creature tokens you control get +1/+1, have haste, and must attack each combat if able.
At the beginning of combat on your turn, create a 1/1 red Soldier creature token.

When Audacious Roughrider enters or leaves the battlefield, exile the top card of your library. Then you may discard a card. If you do, put the exiled card into your hand. If you don't, create a Treasure token.
Wander {4}{R}{R}

Flying, haste
Whenever you attack, you may pay {R} and sacrifice two artifacts and/or enchantments. If you do, return this card from your graveyard to the battlefield tapped and attacking.

Amity — Whenever you attack with Burning Celestial and exactly one other creature, Burning Celestial acclimates.
As long as you control a red Weather, Burning Celestial has trample.

Haste
Level up {2}{R}
[level 1-2] Haste
Whenever this creature attacks, it deals 2 damage to any target.
[level 3+] Haste
Whenever this creature attacks, it deals 5 damage to any target.

Level up {2}{W}
[level 1-2] Whenever you attack, target creature gets +2/+0 until end of turn.
[level 3+] Whenever you attack, target creature gets +5/+0 until end of turn.

Haste
Whenever Penrath Firearm attacks, create a colorless Equipment artifact token with “Equipped creature gets +2/+0” and equip {2} attached to target attacking creature.

Flying, haste
When Plasmana Hellkite enters, it deals 2 damage to any target and 1 damage to any other target.

Trample
Whenever another creature you control becomes the target of a spell you control, create a token that's a copy of that creature, except it has haste. Sacrifice that token at the beginning of the next end step.

Menace
Amity — Whenever you attack with Splitting Smog and exactly one other creature, you may pay {1}{R}. If you do, attacking creatures you control get +2/+0 until end of turn.

Whenever you cast an instant, sorcery, or Aura spell that targets only Star-Seeking Dreamer, copy that spell for each other creature you control that the spell could target. Each copy targets a different one of those creatures.

When this creature enters, create a red Subroutine enchantment token named BOOST with “Whenever this Subroutine runs, add {R}.”

Revered
Trample

At the beginning of combat of your turn, Belief-Belying Beast gains flying until end of turn if you control a creature with flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Level up {4}{G}{G}
[level 1-2] Trample
[level 3+] Trample

When Endangered Scinok dies, put a +1/+1 counter on up to one target creature.

Landfall — Whenever a land you control enters, make a pledge.

When Hearty Roughrider enters or leaves the battlefield, you gain life equal to the greatest toughness among creatures you control.
Wander {4}{G}{G}

At the beginning of combat on your turn, if you have at least 3 life more than your starting life total, untap target land.

Trample
When Idealistic Voter enters, make a pledge.

{2}{G}, {T}: Mill two cards, then create a tapped 1/1 white Citizen creature token.
{6}{G}{G}, {T}: Mill two cards, then create a tapped X/X colorless Construct artifact creature token, where X is the number of creature and/or enchantment cards in your graveyard.