Secret card...

[Firestorm]

While browsing the Gold section of the Apprentice program that I use, I found a card made by the creator of a patch:

Lajiskin
2UBR
Creature - God
4/4
Lajiskin cannot be the target of spells or effects
T: Destroy target permanent.
UBR: Untap Lajiskin
Congratulations, you have found the secret card inserted into the patch. Being the creator of the patch has its perks.
Sets: PR-R

 

[Lotus Mox]

I have found an even weirder card: Mimic, the Monkey!!!

along with some other:
Baseball Glove
Psychedelic Eye
etc.

you can find them if you search for cards with p/t: /100

 

[superguy]

I found the Lajiskin card before... can't seem to find the other cards. Can you explain again how to find them, Lotus Mox?

 

[Lotus Mox]

I don't know if they are in your apprentice patch, but they are definitely in the newest e-league oracle version.

they all have a toughness of 100 and are from the PEZ card game. I'll post a sample of them:

Baseball Glove 0
You can draw up to 3 Flavor cards at the end of each turn as long as you own this complete Dispenser card.
Strawberry
Grape
Grape
Grape
12/100

Mimic the Monkey 2
Action: Replace any Dispenser card on Dispenser Row with the next card from the Dispenser Deck Draw Pile. The card being replaced goes to the bottom of the Dispenser Deck Draw Pile.
Strawberry
Grape
3/100

These cards are apparently no magic cards and I think they were accidently put in this Patch.

 

[Chaos Turtle]

SleipOdin
5GW
Creature - Legend

1, pay 1 life: Put a +1/-1 counter on SleipOdin.
If SleipOdin attacks, remove all +1/-1 counters from it at end of combat.

0/20

I'm a secret card! Congratulations.

...
Found this through sorting by expansion, choosing "PR - Promotional.