Trample
Domain — Whenever this creature deals combat damage to a player, put X +1/+1 counters on target creature you control, where X is the number of basic land types among lands you control.

Target creature gets +2/+2 until end of turn.
Coven — Then if you control three or more creatures with different powers, draw a card.

: Target player gains 1 life.
: Each player loses 1 life.

, Sacrifice a creature: This enchantment deals 2 damage to any target.

Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of creatures you control.

(: Add .)

Exile target monocolored permanent.

Flying
At the beginning of your end step, if a permanent you controlled left the battlefield this turn, put a +1/+1 counter on each tapped creature you control, then untap them.
Choose a Background (You can have a Background as a second commander.)

Trample, myriad (Whenever this creature attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)
As long as this creature is attacking, it gets +X/+0, where X is the number of lands defending player controls.

Outlast (, : Put a +1/+1 counter on this creature. Outlast only as a sorcery.)
Other Sliver creatures you control have outlast .

Other creatures you control get +1/+0.
Whenever a nontoken creature you control dies, Judith deals 1 damage to any target.

Sneak (You may cast this spell for if you also return an unblocked attacker you control to hand during the declare blockers step.)
Draw two cards.

: The next time a source of your choice would deal damage to target creature this turn, that source deals that damage to you instead.

, : Add .

When this creature enters, put a +1/+1 counter on target creature you control.
Channel — , Discard this card: Put a +1/+1 counter on each of up to two target creatures you control.

Flash
This spell costs less to cast for each instant and sorcery card in your graveyard.
This creature enters tapped if it's not your turn.
When this creature enters, tap up to two target creatures.

Draw cards equal to the greatest mana value among historic permanents you control. (Artifacts, legendaries, and Sagas are historic.)

: This creature gets +0/+4 until end of turn.

Sacrifice this creature: Add .

This land enters tapped.
When this land enters, return a land you control to its owner's hand.
: Add .