This game is rather simple. You make a card which is a blend of two cards given by the previous poster, which they got from randomising, whether through the 'random' feature of the gatherer, or some other means. I will give you an example now.
The ingredients: Arrogant Wurm and Petrified Plating
Developing Wurm1GG
Creature - Wurm
Madness 3G, Trample
If ~ was cast from your hand, it enters the battlefield with two plate counters on it.
Whenever ~ is tapped, remove a plate counter from it.
~ has +2/+2 as long as it has no plate counters on it.
2/2
Melek, Master of the Arcane3UR
Legendary Creature - Weird Wizard
Protection from red and from blue
Play with the top card of your library revealed.
You may cast the top card of your library as long as it is blue.
If the top card of your library is red, you may put it into your graveyard and prevent all damage target red source would deal this turn.
5/4
Black Lightning2RB
Creature - Elemental
Haste
At the end of your upkpee, if ~ is in your graveyard, and there are at least three other creature cards in your graveyard, you may exile them and return ~ to the battlefield.
4/1
The ingredients: Arrogant Wurm and Petrified Plating
Developing Wurm 1GG
Creature - Wurm
Madness 3G, Trample
If ~ was cast from your hand, it enters the battlefield with two plate counters on it.
Whenever ~ is tapped, remove a plate counter from it.
~ has +2/+2 as long as it has no plate counters on it.
2/2
Next: Urborg Syphon-Mage and Skirk Shaman
Creature - Human Spellshaper
1BT Discard a Card: Target creature gains Fear until end of turn.
2/2
Next: Melek, Izzet Paragon + Burrenton Forge-Tender
Sasky for the Sig.
I am in your [PACK]. Watching you... do... something.
Legendary Creature - Weird Wizard
Protection from red and from blue
Play with the top card of your library revealed.
You may cast the top card of your library as long as it is blue.
If the top card of your library is red, you may put it into your graveyard and prevent all damage target red source would deal this turn.
5/4
Next:
Nether Shadow and Lightning Elemental
Creature - Elemental
Haste
At the end of your upkpee, if ~ is in your graveyard, and there are at least three other creature cards in your graveyard, you may exile them and return ~ to the battlefield.
4/1
Next: Necrogenesis + Nacatl Hunt-Pride
Sasky for the Sig.
I am in your [PACK]. Watching you... do... something.