Paradox — Whenever you cast a spell from anywhere other than your hand, put a +1/+1 counter on target creature.
Team TARDIS — At the beginning of your end step, untap each creature you control with a counter on it.

: Target creature you control gains protection from the color of your choice until end of turn.

Squad (As an additional cost to cast this spell, you may pay any number of times. When this creature enters, create that many tokens that are copies of it.)
Vigilance
Whenever a creature token you control enters, put a +1/+1 counter on it.

Sacrifice an artifact: Target artifact gains indestructible until end of turn.

Whenever a creature you control dies, put a loyalty counter on Lolth.
0: You draw a card and you lose 1 life.
−3: Create two 2/1 black Spider creature tokens with reach and menace.
−8: You get an emblem with "Whenever an opponent is dealt combat damage by one or more creatures you control, if that player lost less than 8 life this turn, they lose life equal to the difference."

Sacrifice a creature: Target player discards two cards. Activate only as a sorcery.

This land enters tapped unless you control a Forest or a Plains.
: Add or .

When this creature enters, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle.

This spell costs less to cast, where X is the total mana value of historic permanents you control. (Artifacts, legendaries, and Sagas are historic.)
Equipped creature gets +10/+0 and has vigilance.
Equip legendary creature

: Look at target player's hand.

Sacrifice this creature: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

(: Add .)

, Sacrifice this artifact: Target player gets you target drink. You pay any costs for the drink.

Protection from red
Tap five untapped Goblins you control: This creature deals 10 damage to each creature and each player.

+3: Destroy target noncreature permanent.
−2: Gain control of target creature.
−9: Nicol Bolas deals 7 damage to target player or planeswalker. That player or that planeswalker's controller discards seven cards, then sacrifices seven permanents of their choice.

: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.

Whenever another creature you control enters, you may gain 1 life.
Whenever a creature an opponent controls enters, you may have that player lose 1 life.

Flying
At the beginning of combat on your turn, populate. (Create a token that's a copy of a creature token you control.)
Whenever a creature token you control enters, put a +1/+1 counter on this creature.