At the beginning of your upkeep, each player draws a card.
Whenever an opponent draws a card, that player loses 1 life.

Whenever a creature dies, you may pay . If you do, you gain 1 life.

( can be paid with either or 2 life.)
Put target card from a graveyard on top of its owner's library.

Flying
, : Add one mana of any color. ( is the untap symbol.)

As this creature enters, choose a color.
All cards that aren't on the battlefield, spells, and permanents are the chosen color in addition to their other colors.

, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

Draw three cards, then put two cards from your hand on top of your library in any order.

When this creature enters, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each in the mana costs of permanents you control counts toward your devotion to black.)

This spell costs less to cast, where X is the greatest power among creatures you control.
: Add . You gain 2 life.
Whenever a nontoken creature you control enters, put a +1/+1 counter on it and draw a card.

Equipped creature gets +1/+1 and has trample and lifelink.
: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equip

Horsemanship (This creature can't be blocked except by creatures with horsemanship.)
Commanders you control have horsemanship.
Partner (You can have two commanders if both have partner.)

Alliance — Whenever another creature you control enters, choose one that hasn't been chosen this turn —
• Add .
• Put a +1/+1 counter on each creature you control.
• Scry 2, then draw a card.

Trample, haste
If you would put one or more counters on a permanent or player, put twice that many of each of those kinds of counters on that permanent or player instead.
If an opponent would put one or more counters on a permanent or player, they put half that many of each of those kinds of counters on that permanent or player instead, rounded down.

Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.
At the beginning of combat on your turn, if The Ozolith has counters on it, you may move all counters from The Ozolith onto target creature.

Whenever a Forest is tapped for mana, its controller adds an additional .

Equipped creature gets +3/+3 and has protection from each color that's not in your commander's color identity.
Equip commander
Equip

Discard all the cards in your hand, then draw that many cards.

Flash
Lifelink
When this creature enters, exile up to one other target creature. That creature's controller gains life equal to its power.
Evoke—Exile a white card from your hand.

Search your library for a card, put that card into your hand, then shuffle.

Whenever this creature blocks, flip a coin. If you lose the flip, remove this creature from combat and it can't block this turn. Creatures it was blocking that had become blocked by only this creature this combat become unblocked.