This spell costs less to cast for each Gate you control.
Gate Colossus can't be blocked by creatures with power 2 or less.
Whenever a Gate enters the battlefield under your control, you may put Gate Colossus from your graveyard on top of your library.

Flying
Gatekeeper Gargoyle enters the battlefield with a +1/+1 counter on it for each Gate you control.

As Gauntlet of Power enters the battlefield, choose a color.
Creatures of the chosen color get +1/+1.
Whenever a basic land is tapped for mana of the chosen color, its controller adds an additional one mana of that color.

When Geistcatcher's Rig enters the battlefield, you may have it deal 4 damage to target creature with flying.

Whenever a nontoken creature enters the battlefield, if Genesis Chamber is untapped, that creature's controller creates a 1/1 colorless Myr artifact creature token.

When Glass Casket enters the battlefield, exile target creature an opponent controls with converted mana cost 3 or less until Glass Casket leaves the battlefield.

When Glassblower's Puzzleknot enters the battlefield, scry 2, then you get . (You get two energy counters. To scry 2, look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)
, Sacrifice Glassblower's Puzzleknot: Scry 2, then you get .

Whenever another artifact enters the battlefield under your control, Glassdust Hulk gets +1/+1 until end of turn and can't be blocked this turn.
Cycling (, Discard this card: Draw a card.)

Flying
Whenever another artifact enters the battlefield under your control, Glaze Fiend gets +2/+2 until end of turn.

Whenever another artifact enters the battlefield under your control, you may have Glint Hawk Idol become a 2/2 Bird artifact creature with flying until end of turn.
: Glint Hawk Idol becomes a 2/2 Bird artifact creature with flying until end of turn.

When this creature enters the battlefield, create a 1/1 colorless Gnome artifact creature token.

When Golden Egg enters the battlefield, draw a card.
, , Sacrifice Golden Egg: Add one mana of any color.
, , Sacrifice Golden Egg: You gain 3 life.

Equipped creature gets +1/+0 for each Equipment attached to it.
Equip (: Attach to target creature you control. Equip only as a sorcery. This card enters the battlefield unattached and stays on the battlefield if the creature leaves.)

When Golos, Tireless Pilgrim enters the battlefield, you may search your library for a land card, put that card onto the battlefield tapped, then shuffle your library.
: Exile the top three cards of your library. You may play them this turn without paying their mana costs.

Whenever Gonti's Aether Heart or another artifact enters the battlefield under your control, you get (two energy counters).
Pay , Exile Gonti's Aether Heart: Take an extra turn after this one.

Flash
As Grifter's Blade enters the battlefield, choose a creature you control it could be attached to. If you do, it enters the battlefield attached to that creature.
Equipped creature gets +1/+1.
Equip

Grim Poppet enters the battlefield with three -1/-1 counters on it.
Remove a -1/-1 counter from Grim Poppet: Put a -1/-1 counter on another target creature.

, Sacrifice an artifact: Target player mills three cards.
Whenever an artifact enters the battlefield, you may untap Grinding Station.

Guardian Idol enters the battlefield tapped.
: Add .
: Guardian Idol becomes a 2/2 Golem artifact creature until end of turn.

When Guardians of Koilos enters the battlefield, you may return another target historic permanent you control to its owner's hand. (Artifacts, legendaries, and Sagas are historic.)