Enchant land
Enchanted land has “{T}: Add {G}{G}.”

{1}{R}: Erupting Volcamel and up to one other target creature you control get +2/+0 until end of turn.
Whenever you activate a nonmana ability, if you've spent at least six mana to activate nonmana abilities this turn, Erupting Volcamel deals 2 damage to any target.

{T}: Add {C}.
{2}, {T}: For each color among permanents you control, add one mana of that color.

Estrathian Gentrifiers's power is equal to the number of differently named lands you control.
Whenever Estrathian Gentrifiers enters or attacks, you may sacrifice a basic land. If you do, search your library for a land card, put it onto the battlefield, then shuffle.

Enchant creature with another Aura attached to it
Enchanted creature gets +3/+3 and has trample, vigilance, and reach.

Deathtouch
Other Gorgons, Snakes, and Basilisks you control get +1/+1.
Whenever a creature with deathtouch you control deals combat damage to a player or planeswalker, create a Treasure token.

When Exemplar of Grit dies while attacking, return it to the battlefield tapped under its owner's control with a defender counter on it.
When Exemplar of Grit dies while blocking, return it to the battlefield tapped under its owner's control with a decayed counter on it.

As an additional cost to cast this spell, you may sacrifice a creature, sacrifice an artifact, and/or discard a card.
For each additional cost paid to cast this spell, you lose 1 life, draw a card, and create a 1/1 colorless Cyborg artifact creature token.

Flying, vigilance
If you would draw a card, you may exile a card from your graveyard instead. When you do, reveal cards from the top of your library until you reveal a card that shares a card type with the exiled card. Put that card into your hand, and the rest on the bottom in a random order.

Exile the top two cards of your library. You may play those cards until you next cast a spell from your hand.
Flashback {3}{R}{R}

Destroy all creatures.

Double strike
Whenever you attack, mill two cards. For each of the milled cards, you may cast it, then if you don't, creatures you control get +1/+0 until end of turn.

Creatures can't attack you or a planeswalker you control unless their controller pays {1} for each of those creatures beyond the first.

Flying
Whenever an artifact without a loop counter on it is put into your graveyard from the battlefield, return it to the battlefield with a loop counter on it.
{2}{U}: Remove a loop counter from target artifact.

Whenever you amp it up, put a +1/+1 counter on Ferva Sensation.
Remove two counters from Ferva Sensation: It phases out.

Mill X cards. For each land card milled this way, add {B}{B}. For each creature card milled this way, create a 2/2 black Zombie artifact creature token. For each noncreature, nonland card milled this way, draw a card.

Destroy target creature if its mana value is less than or equal to the amount of mana spent to cast this spell.
Flashback {X}{B}{B}{B}

Firebolt deals 2 damage to any target.
Flashback {4}{R}

Haste
Whenever a player casts a spell, if no mana from a basic source was spent to cast it, Flaw in the System deals 2 damage to that player.

Choose target card in a graveyard other than a basic land. Search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. If their library is searched this way, they shuffle it. You gain 1 life for each card exiled this way. That player draws a card for each card exiled from their hand this way.
Flashback {3}{B}

Whenever Forgotten Cultivator attacks, mill three cards. Return a permanent card from among the milled cards to your hand.
Spellcharge 4

{T}: Add {C}. You may sacrifice Fortune Bearer. If you don't, you can't spend this mana to cast a spell from your hand.
Surface {5}{U}{U}. Fortune Bearer surfaces transformed.

Flying
If a source would deal 2 or more damage to Fragile Soul, prevent that damage.

Create a tapped Leyshard token.

Whenever you attack, create a 1/1 colorless Soldier creature token that's tapped and attacking.