Counter all other spells. Exile up to one spell countered this way instead of putting it into its owner's graveyard. You may cast that spell for as long as it remains exiled, and mana of any type can be spent to cast it.

Whenever a creature you control deals combat damage to an opponent, exile the top card of their library. Until end of turn, you may play that card, and mana of any type can be spent to cast it.
Spells you cast and don't own cost {1} less to cast.

Calmed Battleground enters tapped unless you control a Plains.
{T}: Add {B} or {R}.

Amity — Whenever you attack with Calming Celestial and exactly one other creature, Calming Celestial acclimates.
As long as you control a blue Weather, Calming Celestial has flying.

Whenever you attack, draw a card for each attacking creature with power 4 or greater, then put a +1/+1 counter on each attacking creature with power 3 or less.

Trample
When Canopy Creeper enters, create two Berry tokens.

Whenever you attack, you may cast an Aura card or a Blessing from your graveyard if that spell targets an attacking creature.

Sacrifice a Treasure: Capital Maglev gains your choice of haste or trample until end of turn.
Crew 2

Flying
Whenever Capital Skyraiders deals combat damage to a player, integrate the top card of that player's library.
Capital Skyraiders gets +3/+3 as long as four or more cards are integrated onto it.

When Capital Zenith enters, sacrifice it unless you pay {2}.
{T}: Add one mana of any type.

When Capricious Cat enters, it acclimates twice.

Once each turn, when Carefree Kappa enters or becomes the target of a spell or ability, you may create a Weather enchantment token that's all colors named Looks Like Rain with “Whenever you attack, you gain 1 life.”
Carefree Kappa gets +1/+1 for each Weather you control.

Corrupt — When this creature enters, mill three cards. If you control a permanent with greater mana value than this creature, you may cache a creature card from your graveyard.

Vigilance
Once each turn, if you would put one or more counters on a creature you control, you may put that many of each of those kinds of counters on each creature you control instead.

When this enchantment enters and whenever you draw your second card each turn, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Cycling {G}

Wander {2}{W}{W}
[–1]: Create your choice of a 1/1 white Bird creature token with flying or a 2/2 black Cat creature token.
[–2]: If a permanent entering the battlefield under your control this turn causes an ability of a permanent you control to trigger, that ability triggers an additional time.
[–3]: Put a +1/+1 counter on each creature you control.

Create a token that's a copy of target creature, except it's 3/3.

When this creature dies, create a black Subroutine enchantment token named TICK with “Whenever this Subroutine runs, each opponent loses 1 life and you gain 1 life.”
{1}{B}: Return this card from your graveyard to the battlefield tapped. Activate only if a card left your graveyard this turn.

{2}{R/W}: This creature gets +2/+0 until end of turn.
When this creature dies, create a 1/1 white Citizen creature token.

Whenever this creature attacks, it deals 1 damage to any target.
{3}{B}: This creature gains indestructible until end of turn.

Level up {1}{W}
[level 1-2] Creatures you control with level up have vigilance and ward {2}.
[level 3+] Creatures you control with level up have vigilance and ward {4}.

Draw a card if you discarded a card this turn.
You gain 3 life if you've lost life this turn.
Create a 1/1 white Golem creature token if a creature you controlled left the battlefield this turn.

The owner of target artifact or enchantment an opponent controls shuffles it into their library. You may shuffle up to four target cards from your graveyard into your library.

Target opponent loses 3 life unless they discard a nonland card, then loses 3 life unless they sacrifice a nonland permanent. You gain life equal to the amount of life lost this way.

At the beginning of your end step, for each opponent with an even number of cards in hand, they lose 3 life and you gain 3 life.
[+1]: Target player draws a card and loses 1 life.
[–4]: Target opponent exiles one or more cards from their hand. Then you may have that player exchange their hand and the exiled cards.