Reach (This creature can block creatures with flying.)

[+1]: Until your next turn, prevent all damage target permanent would deal.
[0]: Until end of turn, Gideon of the Trials becomes a 4/4 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn.
[0]: You get an emblem with "As long as you control a Gideon planeswalker, you can't lose the game and your opponents can't win the game."

As Gideon's Intervention enters the battlefield, choose a card name.
Your opponents can't cast spells with the chosen name.
Prevent all damage that would be dealt to you and permanents you control by sources with the chosen name.

When Gideon's Resolve enters the battlefield, you may search your library and/or graveyard for a card named Gideon, Martial Paragon, reveal it, and put it into your hand. If you search your library this way, shuffle it.
Creatures you control get +1/+1.

[+2]: Untap all creatures you control. Those creatures get +1/+1 until end of turn.
[0]: Until end of turn, Gideon, Martial Paragon becomes a 5/5 Human Soldier creature with indestructible that's still a planeswalker. Prevent all damage that would be dealt to him this turn.
[−10]: Creatures you control get +2/+2 until end of turn. Tap all creatures your opponents control.

Enchant land
When Gift of Paradise enters the battlefield, you gain 3 life.
Enchanted land has ": Add two mana of any one color."

End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)
At the beginning of your next end step, you lose the game.

You may exert Glory-Bound Initiate as it attacks. When you do, it gets +1/+3 and gains lifelink until end of turn. (An exerted creature won't untap during your next untap step.)

Flying, haste
You may exert Glorybringer as it attacks. When you do, it deals 4 damage to target non-Dragon creature an opponent controls. (An exerted creature won't untap during your next untap step.)

Flying
Whenever Glyph Keeper becomes the target of a spell or ability for the first time each turn, counter that spell or ability.
Embalm (, Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie Sphinx with no mana cost. Embalm only as a sorcery.)

Whenever Graceful Cat attacks, it gets +1/+1 until end of turn.

: Add .
, , Sacrifice Grasping Dunes: Put a -1/-1 counter on target creature. Activate this ability only any time you could cast a sorcery.

When Gravedigger enters the battlefield, you may return target creature card from your graveyard to your hand.

Greater Sandwurm can't be blocked by creatures with power 2 or less.
Cycling (, Discard this card: Draw a card.)

Grim Strider gets -1/-1 for each card in your hand.

You may exert Gust Walker as it attacks. When you do, it gets +1/+1 and gains flying until end of turn. (An exerted creature won't untap during your next untap step.)

Target creature you control gains hexproof until end of turn. Remove all -1/-1 counters from it. (A creature with hexproof can't be the target of spells or abilities your opponents control.)

Whenever Hapatra, Vizier of Poisons deals combat damage to a player, you may put a -1/-1 counter on target creature.
Whenever you put one or more -1/-1 counters on a creature, create a 1/1 green Snake creature token with deathtouch.

Whenever an opponent activates an ability of an artifact, creature, or land on the battlefield, if it isn't a mana ability, Harsh Mentor deals 2 damage to that player.

Search your library for up to X basic land cards, where X is the number of tapped creatures you control, and put those cards onto the battlefield tapped. Then shuffle your library.