Flying
Whenever Ganax or another Dragon you control enters, create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")
Choose a Background (You can have a Background as a second commander.)

(Gain the next level as a sorcery to add its ability.)
When this Class enters, create a 1/1 blue and red Otter creature token with prowess.
: Level 2
When this Class becomes level 2, return target instant or sorcery card from your graveyard to your hand.
: Level 3
Whenever you cast an instant or sorcery spell, create a 1/1 blue and red Otter creature token with prowess.

Cumulative upkeep—Exile the top card of your library. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When a player doesn't pay this enchantment's cumulative upkeep, that player exiles all cards from their library.
Exile the top card of your library: Prevent the next 1 damage that would be dealt to you this turn.

Activated abilities of artifacts and creatures can't be activated unless they're mana abilities.

You may choose not to untap this creature during your untap step.
As this creature enters, an opponent chooses a creature type.
: Gain control of target creature that isn't of the chosen type for as long as this creature remains tapped.

Lifelink
, : Another target creature you control gains lifelink until end of turn.
Whenever you gain life, put a +1/+1 counter on target creature you control. If you have a full party, put three +1/+1 counters on that creature instead.

Whenever one or more Elves you control attack, they gain deathtouch until end of turn.
Each creature you control has "Whenever a mana ability of this creature resolves, put a number of +1/+1 counters on it equal to the amount of mana this creature produced. This ability triggers only once each turn."

Umbris gets +1/+1 for each card your opponents own in exile.
Whenever Umbris or another Nightmare or Horror you control enters, target opponent exiles cards from the top of their library until they exile a land card.

Add .

Equipped creature gets +1/+1 for each Swamp you control.
Equip—Pay 3 life. (Pay 3 life: Attach to target creature you control. Equip only as a sorcery.)

: Add .
: Add . Activate only if you control a Swamp or a Forest.

Flying
Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)
: Skithiryx gains haste until end of turn.
: Regenerate Skithiryx.

Flying
If you would lose the game, instead exile this creature and your life total becomes equal to your starting life total.

Constellation — Whenever Calix or another enchantment you control enters, put a +1/+1 counter on target creature.
Whenever Calix or an enchanted creature you control deals combat damage to a player, you may create a token that's a copy of a nonlegendary enchantment you control. Do this only once each turn.

This spell can't be countered.
: Target spell can't be countered.

Search your library for up to X cards, put those cards into your hand, then shuffle.

Flying
You don't lose unspent red mana as steps and phases end.
Whenever you cast an instant or sorcery spell, add .
When Electro leaves the battlefield, you may pay . When you do, he deals X damage to target player.

Reach, vigilance, trample
When Zacama enters, if you cast it, untap all lands you control.
: Zacama deals 3 damage to target creature.
: Destroy target artifact or enchantment.
: You gain 3 life.

This creature can't be blocked.
Whenever this creature deals combat damage to a player, that player reveals their hand. You choose a card from it. That player exiles that card.

, Exile this creature: Exile all creatures. At the beginning of the next end step, return those cards to the battlefield under their owners' control.