Seeing as a decent portion of the community plays MTG, I figure we could work together to create a working set. Simply post a card concept, be it a champion, item, map, or other, and we will try to make this work.

What will be in the set
Champions: Legendary Creatures, can be any combination of colors (or lack thereof), but must fit flavor.
Jungle Monsters/Pets: Normal Creatures
Items: Artifacts, equipments, enchantments, you name it.
Maps: Lands or Planes.
Areas (I.E Zaun, Ionia): Definitely Planes

MTG Color personalities
White (W): White strives for peace and justice at it's best, however at it's worst, it's overzealous, and controlling.

Blue (U): Blue is clever, innovative, and cunning at it's best, however, at it's worst, Blue is manipulative and controlling.

Black (B): Black at it's best is willing to do anything for power. At it's worst, black is sadistic.

Red (R): At it's best, red is passionate and deadly efficient. At it's worst, red is impulsive and volatile.

Green (G): Green likes big numbers on the bottom right of the creature spells. And tokens.

I'll add some cards to get the ball rolling.

Skarner, the Crystal Vanguard 3UG
Legendary Creature - Insect {R}
When Skarner, the Crystal Vanguard attacks, gain control of target creature until end of turn. Untap that creature.
4/5

Viktor, the Machine Herald 4UU
Legendary Artifact Creature - Human Construct {R}
When Viktor, the Machine Herald enters the battlefield, put a legendary equipment token named The Hex Core onto the battlefield attached to Viktor. The Hex Core has the abilities of each artifact exiled by Viktor.
When a creature dealt damage by Viktor this turn dies, you may search your library for an equipment card and exile it. If you do, shuffle your library.
3/3

Rabid Wolf 2G
Creature - Wolf {C}
Blessing - When Rabid Wolf dies, you may exile it blessing target creature. If you do, untap that creature.
Creatures blessed by Rabid Wolf get +1/+1.
2/2

I would picture skarner more like:

Skarner, the Crystal Vanguard 3GU
Legendary Creature - Insect {R}
2UG: Skarner deals 2 damage to target creature. That creature loses all abilities until end of turn, deals no damage until end of turn, and must attack this turn if able.
3/3

Note: Every lol champ is legendary.

Mordekaiser 3BBB
Legendary Artifact Creature - Horror
If Mordekaiser blocks a creature, prevent X damage where X is Mordekaizer's power.
BBBB: Mordekaiser deals 2 damage to target creature and his controller gains 2 life. Until end of turn if that creature dies put a black spirit token into play with power and toughness equal to that creature's power and toughness.
3/3

Shyvana, the Dragonborn 2RR
Legendary Creature - Human Dragon {R}
Shyvana, the Dragonborn's name is also Shyvana, Dragon's Descent.
When Shyvana attacks, put a Fury counter onto Shyvana.
Whenever a Fury counter is put onto Shyvana, if she has 4 or more counters, transform Shyvana.
3/4
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Shyvana, Dragon's Descent
(R) Legendary Creature - Dragon {R}
Flying
Shyvana, Dragon's Descent's name is also Shyvana, the Dragonborn.
When Shyvana, Dragon's Descent deals combat damage to a creature, Shyvana deals that much damage to each other creature that creature's controller controls.
5/5

Lulu, Fae Sorceress 3G
Legendary Creature - Yordle Shaman {R}
G,Tap: Target creature gets +3/+3 until end of turn.
G,Tap: Target creature becomes a 1/1 green squirrel with no abilities until end of turn.
0/3

Enhanced Crystal Arrow 1WW
Snow Instant {U}
Enhanced Crystal Arrow deals 5 damage divided any way you choose to any number of target attacking or blocking creatures.

Purple Caster Minion 1
Creature - Wizard {C}
Reach
1/1