Magic: The Gathering Arena

Karn, the Great Creator
CMC: 4

Starting Loyalty: 5

Activated abilities of artifcats your opponents control can't be activated.
+1: Until your next turn, up to one target noncreature artifact you control becomes an artifact creature with base power and toughness equal to it's converted mana cost
-2: You may choose an artifact card you control from outside the game or in exile, reveal that card, and put it into your hand.

Gideon Blackblade
CMC: 1WW

Starting Loyalty: 4
As long as it's your turn, Gideon Blackblade is a 4/4 Human Soldier Creature with Indestructible that's still a planeswalker.
Prevent all damage that would be dealt to Gideon Blackblade during your turn.
+1: Up to one target creature of your choice gains Vigilance, Lifelink or Indestructible until end of turn.
-4: Exile Target Nonland Permanent

Chandra, Fire Artisan 2 RR - Rare
Whenever one or more loyalty counters are removed from Chandra, Fire Artisan, she deals that much damage to target opponent or planeswalker.
+1 Exile the top card of your library. You may play it this turn.
-7 Exile the top seven cards of your library. You may play them this turn.
4 Loyalty

-Roalesk, Apex Hybrid (2)GGU
Flying, Trample
When ~ enters the battlefield, put 2 +1+1 counters on target creature you control
When ~ dies, proliferate, then proliferate again.

Nicol Bolas, Dragon-God UBBBR
~ Has all loyalty abilities of all other planeswalkers on the battlefield
+1 You draw a card, each opponent exiles a card from their hand or a permanent they control
-2 Destroy target creature or Planeswalker
-8 Each opponent who doesn't control a legendary creature or planeswalker loses the game

Niv-Mizzet Reborn WUBRG
Flying
When ~ enters the battlefield, reveal the top 10 cards of your library. For each color pair, choose a card that's exactly those colors from among them. Put the chosen cards into your hand and the rest on the bottom of your library in a random order

Teferi, Time Raveler (1)WU
Each opponent can cast spells only at any time they could cast a sorcery
+1 Until your next turn, cast sorceries as if they had flash
-3 Return up to one target artifact, creature or enchangment to its owner's hand, draw a card.

Sorin, Vengeful Bloodlord (2)WB
As long as it's your turn, creatures and planeswalkers you control have lifelink
+2 ~ deals 1 damage to target player or planeswalker
-X return target creature with converted mana cost X from your graveyard or the battlefield. That creature is a vampire in addition to its other types

Nissa
Whenever you tap Forest for mana, add an additional G
+1 put 3 +1/+1 counters on up to one noncreature land you control. It becomes creature Elemental with vigilance and reach. It's still a land.

-8 emblem "lands you control have indestructible". Search your library for any number of Forests, put into play tapped, then shuffle your library.

Ral
Whenever you cast or copy an instant or sorcery spell, deal 1 damage to creature/walker.
+2 Scry 1
-2 Whenever you cast instant/sorcery spell this turn, copy it. You may choose new targets for the copy.

Domri
Creatures you control get +1/+0
+1 add R or G. Creature spells you play can't be countered this turn.
-2 Target creature you control fights target creature you don't control