Enchant opponent

When Overencumbered enters, enchanted opponent creates a Clue token, a Food token, and a Junk token.

At the beginning of combat on enchanted opponent's turn, that player may pay for each artifact they control. If they don't, creatures can't attack this combat.

Target player draws seven cards.

Enrage — Whenever Overgrown Armasaur is dealt damage, create a 1/1 green Saproling creature token.

Sacrifice a land: You gain 3 life.

When Overgrown Pest enters, look at the top five cards of your library. You may reveal a land or double-faced card from among them and put that card into your hand. Put the rest on the bottom of your library in a random order.

: Add one mana of any color.

: Add two mana of any one color. Spend this mana only to turn permanents face up.

When Overgrowth Elemental enters, put a +1/+1 counter on another target Elemental you control.

Whenever another creature you control dies, you gain 1 life. If that creature was an Elemental, put a +1/+1 counter on Overgrowth Elemental.

Kicker (You may pay an additional as you cast this spell.)

Destroy target artifact if its mana value is 2 or less. If this spell was kicked, destroy that artifact if its mana value is 5 or less instead.

Impending 5— (If you cast this spell for its impending cost, it enters with five time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.)

Whenever Overlord of the Balemurk enters or attacks, mill four cards, then you may return a non-Avatar creature card or a planeswalker card from your graveyard to your hand.

Impending 4— (If you cast this spell for its impending cost, it enters with four time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.)

Flying

Whenever Overlord of the Floodpits enters or attacks, draw two cards, then discard a card.

Impending 4— (If you cast this spell for its impending cost, it enters with four time counters and isn't a creature until the last is removed. At the beginning of your end step, remove a time counter from it.)

Whenever Overlord of the Mistmoors enters or attacks, create two 2/1 white Insect creature tokens with flying.

Freerunning (You may cast this spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or commander.)

Untap all creatures you control that attacked this turn. If it's your main phase, there is an additional combat phase after this phase, followed by an additional main phase.

Counter target spell unless its controller pays for each artifact you control.

Creatures you control get +3/+3 and gain trample until end of turn. (Each of those creatures can deal excess combat damage to the player or planeswalker it's attacking.)

First Contact — Whenever Overseer of Vault 76 or another creature you control with power 3 or less enters, put a quest counter on Overseer of Vault 76.

At the beginning of combat on your turn, you may remove three quest counters from among permanents you control. When you do, put a +1/+1 counter on each creature you control and they gain vigilance until end of turn.

At the beginning of your upkeep, if you have four or more creature cards in your graveyard, you may return target creature card from your graveyard to your hand.

Menace

Whenever Overt Operative deals combat damage to a player, it assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Creatures you control get +3/+3 until end of turn.

When Overwhelmed Archivist enters, draw a card, then discard a card.

Disturb (You may cast this card from your graveyard transformed for its disturb cost.)

Creatures you control gain vigilance and trample until end of turn. Roll a d20.

1–9 | Creatures you control get +2/+2 until end of turn.

10–19 | Put two +1/+1 counters on each creature you control.

20 | Put four +1/+1 counters on each creature you control.

Whenever you attack with three or more creatures, draw a card.

This spell costs less to cast for each creature card in your graveyard.

Exile target creature or planeswalker.

Until end of turn, creatures you control gain trample and get +X/+X, where X is the greatest power among creatures you control.

Vigilance

Ox Drover can't be blocked by Oxen.

Whenever Ox Drover enters or attacks, target opponent creates a 2/4 white Ox creature token and you draw a card.

Each player chooses a land they control of each basic land type. Return those lands to their owners' hands.

Draw three cards, untap up to two lands, then discard a card.

Enchant permanent

When Psychic Overload enters, tap enchanted permanent.

Enchanted permanent doesn't untap during its controller's untap step.

Enchanted permanent has "Discard two artifact cards: Untap this permanent."

Return target creature card from your graveyard to your hand.

Draw a card.

Other Kobolds you control get +2/+2.

Whenever you cast a Kobold spell, you may pay . If you do, create a 4/4 red Dragon creature token with flying.

Whenever you cast a Dragon spell, create a 0/1 red Kobold creature token named Kobolds of Kher Keep.

As an additional cost to cast this spell, tap four untapped creatures you control.

Draw three cards.

Flying

Skycat Sovereign gets +1/+1 for each other creature you control with flying.

: Create a 1/1 white Cat Bird creature token with flying.

: Search your library for a Sliver card, reveal that card, put it into your hand, then shuffle.

: Gain control of target Sliver. (This effect lasts indefinitely.)

Affinity for artifacts (This spell costs less to cast for each artifact you control.)

Flying

Target player loses 3 life and you gain 3 life.

Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Whenever a creature you control attacks alone, you may search your library for an Aura card that could enchant that creature, put it onto the battlefield attached to that creature, then shuffle.

Other Squirrels you control get +1/+1.

Flying

Shadow (This creature can block or be blocked by only creatures with shadow.)

: Creatures with shadow get +1/+0 until end of turn and creatures without shadow get -1/-0 until end of turn.

Tempting offer — Search your library for a land card and put it onto the battlefield. Each opponent may search their library for a land card and put it onto the battlefield. For each opponent who searches a library this way, search your library for a land card and put it onto the battlefield. Then each player who searched a library this way shuffles.

You gain 2 life. Then you may discard two cards. If you do, draw three cards.

Whenever a creature token leaves the battlefield, put a +1/+1 counter on Twilight Drover.

, Remove a +1/+1 counter from Twilight Drover: Create two 1/1 white Spirit creature tokens with flying.

Whenever Undercover Butler attacks the player with the most life or tied for most life, it can't be blocked this turn.

You may have Undercover Operative enter as a copy of any creature on the battlefield, except it enters with a shield counter on it if you control that creature. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Flying

Sphinx spells you cast cost less to cast.

Whenever Unesh, Criosphinx Sovereign or another Sphinx you control enters, reveal the top four cards of your library. An opponent separates those cards into two piles. Put one pile into your hand and the other into your graveyard.

Flying

When Vampire Sovereign enters, target opponent loses 3 life and you gain 3 life.

At the beginning of your end step, if you control no untapped lands, draw a card.