This land enters tapped unless you control one or fewer other lands.
{T}: Add {B} or {G}.
Cycling {2}

As an additional cost to cast this spell, exile a card from your graveyard.
Search your library for a card with the same mana value as the exiled card, reveal it, put it into your hand, then shuffle. You lose 2 life.

Search your library for up to two Forest cards, reveal them, put them into your hand, then shuffle.

Flash
Approval — When Congressional Kraken enters, return each nonland permanent with mana value less than or equal to the number of colors among permanents you control to their owners' hands.

Flow — {4}{W}: Create a tapped 0/0 colorless Golem artifact creature token with “This creature gets +1/+1 for each artifact you control.”

Flying
When Skylance Escort enters, put a vigilance counter on each creature you control.

Favored
Legendary creatures you control have trample.

When this creature enters, choose one —
• Exile target enchantment.
• Exile target player's graveyard.

Favored
Whenever your Champion attacks, creatures you control get +2/+2 until end of turn.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Flying, trample
If a source you control would deal damage to an opponent or a permanent an opponent controls, you may have it deal twice that much damage instead if it's a Dragon or Iviana planeswalker. Otherwise, it deals that much damage plus 2 instead.

Flying
{1}, {T}: Surveil 1. This ability costs {1} less to activate if you control a blue permanent.

Double target creature's power and toughness until end of turn.
Flashback {1}{G}

When Remnant of Zakros enters, choose one —
• Each player sacrifices a creature.
• Each player sacrifices an enchantment.

Vigilance
When Indomitable Jicru enters, you gain 5 life and draw a card. If it wandered, creatures you control get +2/+2 until end of turn.
Wander {6}{G}{W}

When Gone Pickin' enters, exile up to one target nonland permanent an opponent controls until Gone Pickin' leaves the battlefield. Then create a Berry token. You may attach it to a creature you control.

Equipped creature gets +2/+1 and has “At the beginning of your end step, put a time counter on Blade of Clouded Pasts.”
{2}, Sacrifice Blade of Clouded Pasts: Target player loses X life and discards X cards, where X is one plus the number of time counters on it. Activate only as a sorcery.
Equip {2}

When Urban Explorer enters, return a permanent card with mana value 1 or less from your graveyard to your hand.
Landfall — Whenever a land you control enters, Urban Explorer gets +2/+1 until end of turn.

{T}: Add one mana of any type.
{T}, Sacrifice two permanents named Reactor Sphere: Draw three cards.

Open Air Boardwalk enters tapped.
{T}: Add {G} or {W}.
{4}: Make a pledge. Activate only as a sorcery.

Damned — This spell costs {1} less to cast for each permanent you've sacrificed this turn.
Whenever you sacrifice a permanent, this creature deals 2 damage to target opponent unless they exile a permanent they control. You may play cards exiled this way for as long as they remain exiled, and you may spend mana of any type to cast them.

Abandoned Poppet can't be blocked by creatures with power 2 or less.
Whenever a creature an opponent controls dies, they lose 2 life.

Return a land you control to its owner's hand: Plated Tunneler gets +1/+0 and gains menace until end of turn.

[+2]: Each player puts their hand on the bottom of their library in a random order. You draw five cards, then each opponent draws two cards.
[+1]: Untap each land you control.
[–3]: Return up to three target nonland permanents to their owner's hands.
[–9]: You get an emblem with “Whenever an opponent casts their first spell each turn, gain control of it. You may choose new targets for that spell.”

Vigilance
Whenever Bureau Mentor attacks, teach target attacking creature with lesser power vigilance. Untap that creature.