Tetravus

Flying
Tetravus enters the battlefield with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and “This creature can’t be enchanted.”
At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1/+1 counters on Tetravus.

Fireball

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Red Mana Battery

, : Put a charge counter on Red Mana Battery.
, Remove any number of charge counters from Red Mana Battery: Add , then add an additional for each charge counter removed this way.

Rebirth

Remove Rebirth from your deck before playing if you’re not playing for ante.
Each player may ante the top card of their library. If a player does, that player’s life total becomes 20.

Brothers of Fire

: Brothers of Fire deals 1 damage to any target and 1 damage to you.

Feldon’s Cane

, Exile Feldon’s Cane: Shuffle your graveyard into your library.

Cyclone

At the beginning of your upkeep, put a wind counter on Cyclone, then sacrifice Cyclone unless you pay for each wind counter on it. If you pay, Cyclone deals damage equal to the number of wind counters on it to each creature and each player.

Mind Bomb

Each player may discard up to three cards. Mind Bomb deals damage to each player equal to 3 minus the number of cards they discarded this way.

Tetravus

Flying
Tetravus enters the battlefield with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and “This creature can’t be enchanted.”
At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1/+1 counters on Tetravus.

Leviathan

Trample
Leviathan enters the battlefield tapped and doesn’t untap during your untap step.
At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap Leviathan.
Leviathan can’t attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)

Mana Clash

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players’ coins come up heads on the same flip.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you.
: Add one mana of any color.

Ashnod’s Transmogrant

, Sacrifice Ashnod’s Transmogrant: Put a +1/+1 counter on target nonartifact creature. That creature becomes an artifact in addition to its other types.

Abomination

Whenever Abomination blocks or becomes blocked by a green or white creature, destroy that creature at end of combat.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you.
: Add one mana of any color.

Cyclone

At the beginning of your upkeep, put a wind counter on Cyclone, then sacrifice Cyclone unless you pay for each wind counter on it. If you pay, Cyclone deals damage equal to the number of wind counters on it to each creature and each player.

Cocoon

Enchant creature you control
When Cocoon enters the battlefield, tap enchanted creature and put three pupa counters on Cocoon.
Enchanted creature doesn’t untap during your untap step if Cocoon has a pupa counter on it.
At the beginning of your upkeep, remove a pupa counter from Cocoon. If you can’t, sacrifice it, put a +1/+1 counter on enchanted creature, and that creature gains flying.

Johan

At the beginning of combat on your turn, you may have Johan gain “Johan can’t attack” until end of combat. If you do, attacking doesn’t cause creatures you control to tap this combat if Johan is untapped.

Serpent Generator

, : Create a 1/1 colorless Snake artifact creature token. It has “Whenever this creature deals damage to a player, that player gets a poison counter.” (A player with ten or more poison counters loses the game.)