Ivy Elemental enters with X +1/+1 counters on it.

Choose two —
• Target player loses X life.
• Return target creature card with mana value X or less from your graveyard to the battlefield.
• Target creature gets -X/-X until end of turn.
• Up to X target creatures gain fear until end of turn. (They can't be blocked except by artifact creatures and/or black creatures.)

At the beginning of your upkeep, you draw a card and you lose 1 life.

Equipped creature gets +3/+0 and has trample and lifelink.
Equip

Master of Etherium's power and toughness are each equal to the number of artifacts you control.
Other artifact creatures you control get +1/+1.

Changeling (This card is every creature type.)
Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature.

Skeletons you control and other Zombies you control get +1/+1 and have deathtouch. (Any amount of damage they deal to a creature is enough to destroy it.)

Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase.

Trample
Tap an untapped artifact you control: Lodestone Myr gets +1/+1 until end of turn.

Whenever a player casts a spell, you may put a +1/+1 counter on Forgotten Ancient.
At the beginning of your upkeep, you may move any number of +1/+1 counters from Forgotten Ancient onto other creatures.

Whenever a creature you control dies, each other player sacrifices a creature of their choice.

At the beginning of your upkeep, Rumbling Slum deals 1 damage to each player.

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

During your turn, creatures you control get +2/+0.
During turns other than yours, creatures you control get +0/+2.

Door to Nothingness enters tapped.
, , Sacrifice Door to Nothingness: Target player loses the game.

Other red creatures you control get +1/+1.
Other white creatures you control get +1/+1.
Whenever you cast a red spell, Balefire Liege deals 3 damage to target player or planeswalker.
Whenever you cast a white spell, you gain 3 life.

Put target artifact or creature card from a graveyard onto the battlefield under your control. Shuffle Beacon of Unrest into its owner's library.

Trample, haste
When Menacing Ogre enters, each player secretly chooses a number. Then those numbers are revealed. Each player with the highest number loses that much life. If you are one of those players, put two +1/+1 counters on Menacing Ogre.

Flying, haste

Flying (This creature can't be blocked except by creatures with flying or reach.)
Other black creatures get +1/+1.
Nonblack creatures get -1/-1.

Whenever Nefashu attacks, up to five target creatures each get -1/-1 until end of turn.

, : Destroy target land. If that land was nonbasic, untap Helldozer.

Destroy all artifacts, creatures, and enchantments.
Cycling (, Discard this card: Draw a card.)

When Tornado Elemental enters, it deals 6 damage to each creature with flying.
You may have Tornado Elemental assign its combat damage as though it weren't blocked.

Pentavus enters with five +1/+1 counters on it.
, Remove a +1/+1 counter from Pentavus: Create a 1/1 colorless Pentavite artifact creature token with flying.
, Sacrifice a Pentavite: Put a +1/+1 counter on Pentavus.

Trample
Whenever Living Hive deals combat damage to a player, create that many 1/1 green Insect creature tokens.

Untap all creatures and gain control of them until end of turn. They gain haste until end of turn.

Trample
, Sacrifice an artifact: Bosh, Iron Golem deals damage equal to the sacrificed artifact's mana value to any target.

Flying, vigilance, haste
: The next 3 damage that would be dealt to target creature you control this turn is dealt to another target creature instead.

At the beginning of each upkeep, create a 1/1 green Saproling creature token.

Artifacts you control have indestructible. (Effects that say "destroy" don't destroy them. Artifact creatures with indestructible can't be destroyed by damage.)

Affinity for artifacts (This spell costs less to cast for each artifact you control.)
Flying
Broodstar's power and toughness are each equal to the number of artifacts you control.