You may have Body Double enter as a copy of any creature card in a graveyard.
0 /
0
{1}{U}{B}
Dimir Doppelganger
Creature - Shapeshifter
{1}{U}{B}: Exile target creature card from a graveyard. Dimir Doppelganger becomes a copy of that card, except it has this ability.
0 /
2
{2}{U}{B}
Evil Twin
Creature - Shapeshifter
You may have Evil Twin enter the battlefield as a copy of any creature on the battlefield, except it has "{U}{B}, {T}: Destroy target creature with the same name as this creature."
0 /
0
{4}{B}{B}
Nightmare Moon
Legendary Creature - Alicorn
Flying
As long as it's nighttime, Nightmare Moon gets +2/+2 and has menace.
{6}: Transform Nightmare Moon. Anypony may activate this ability or help pay the cost. When they do, they become your friend.
6 /
6
--
Princess Luna
Legendary Creature - Alicorn
Flying
When this creature transforms into Princess Luna, choose up to six cards you own from outside the game with a moon in their art, then exile those cards. As long as those cards remain exiled, you may cast them, and your friends may cast them with your permission. (Gifts are appreciated.)
6 /
6
{W}{U}
Princess Twilight Sparkle
Legendary Creature - Alicorn
Flying
Other Alicorns, Horses, Pegasi, Ponies, and Unicorns you control get +1/+1.
{W}{U}{B}{R}{G}: If you control Applejack, Fluttershy, Pinkie Pie, Rainbow Dash, and Rarity, everypony wins the game.
2 /
2
{1}{W}{U}
Rarity
Legendary Creature - Unicorn
Rare and mythic rare spells you cast cost {1} less to cast.
{1}, {T}, Reveal a My Little Pony® toy you own: Until end of turn, another target creature gains protection from each color in that toy's coat, mane, and outfit.
2 /
2
{4}
Soul Foundry
Artifact
Imprint -- When Soul Foundry enters the battlefield, you may exile a creature card from your hand.
{X}, {T}: Create a token that's a copy of the exiled card. X is the mana value of that card.
{3}{U}
Stunt Double
Creature - Shapeshifter
Flash
You may have Stunt Double enter the battlefield as a copy of any creature on the battlefield.
0 /
0
{1}{U}
_____
Creature - Shapeshifter
{1}: This card's name becomes the card name of your choice. Activate anywhere, anytime.