Whenever Sabertooth Cobra deals damage to a player, that player gets a poison counter. The player gets another poison counter at the beginning of their next upkeep unless they pay before that step. (A player with ten or more poison counters loses the game.)

Reach (This creature can block creatures with flying.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

At the beginning of your upkeep, add . Until end of turn, you don't lose this mana as steps and phases end.

Whenever a land you control is tapped for mana, add an additional one mana of any type that land produced for each other land you control with the same name as it.

Put two +1/+1 counters on target creature and untap it. It gains hexproof until end of turn. (Then exile this card. You may cast the creature later from exile.)

When Serpent Assassin enters the battlefield, you may destroy target nonblack creature.

Other Snake creatures you control get +2/+2.

Whenever a Snake you control deals combat damage to a player, you may draw a card.

, Sacrifice a creature: Target creature gets +3/+3 until end of turn.

At the beginning of your upkeep, sacrifice a Snake.

Whenever Shisato, Whispering Hunter deals combat damage to a player, that player skips their next untap step.

As long as you control a Desert or there is a Desert card in your graveyard, Sidewinder Naga gets +1/+0 and has trample.

Deathtouch

Exploit (When this creature enters the battlefield, you may sacrifice a creature.)

When Sidisi, Undead Vizier exploits a creature, you may search your library for a card, put it into your hand, then shuffle.

Megamorph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.)

When Silumgar Spell-Eater is turned face up, counter target spell unless its controller pays .

, Sacrifice another creature or an artifact: For each opponent, you mill a card, then return that card from your graveyard to your hand unless that player pays 3 life. (To mill a card, put the top card of your library into your graveyard.)

Choose a Background (You can have a Background as a second commander.)

Deathtouch

When Skullwinder enters the battlefield, return target card from your graveyard to your hand, then choose an opponent. That player returns a card from their graveyard to their hand.

Tribute 3 (As this creature enters the battlefield, an opponent of your choice may put three +1/+1 counters on it.)

When Snake of the Golden Grove enters the battlefield, if tribute wasn't paid, you gain 4 life.

, , Sacrifice Soulcoil Viper: Return target creature card from your graveyard to the battlefield with a finality counter on it. Activate only as a sorcery. (If a creature with a finality counter on it would die, exile it instead.)

Flying

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Spire Winder gets +1/+1 as long as you have the city's blessing.

: Steeple Creeper gains flying until end of turn.

Whenever a creature you control with toughness 4 or greater dies, you gain 4 life.

When Sultai Soothsayer enters the battlefield, look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard.

Whenever Tangle Asp blocks or becomes blocked by a creature, destroy that creature at end of combat.

Reach, deathtouch

When Tower Winder enters the battlefield, search your library and/or graveyard for a card named Command Tower, reveal it, and put it into your hand. If you search your library this way, shuffle.

: Vector Asp gains infect until end of turn. (It deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.)

First strike

Whenever Voracious Cobra deals combat damage to a creature, destroy that creature.

Defender (This creature can't attack.)

: Destroy Wall of Vipers and target creature it's blocking. Any player may activate this ability.

You may exert Watchful Naga as it attacks. When you do, draw a card. (An exerted creature won't untap during your next untap step.)

Other enchantment creatures you control get +1/+1.

, : Copy target activated or triggered ability you control from an enchantment source. You may choose new targets for the copy. (Mana abilities can't be targeted.)

Flash (You may cast this spell any time you could cast an instant.)

Flying

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)

Deathtouch

Whenever Yuan-Ti Fang-Blade deals combat damage to a player, venture into the dungeon. (Enter the first room or advance to the next room.)

Whenever this creature mutates, target creature an opponent controls gets -2/-2 until end of turn.

: Choose a color. Whenever Zombie Boa becomes blocked by a creature of that color this turn, destroy that creature. Activate only as a sorcery.