Community

With a power so high then I guess
The CMC is 4 like brink of madness

Jellyfish Warrior 2gu
Creature - Human Jellyfish
Whenever jellyfish warrior deals combat damage, draw a card and then discard a card for each creature blocking jellyfish warrior. For each card discarded this way, return a creature to it's owner's hand.
5/4

Its power may be high, but its cost is lower. It does not cost fo-ur.
Though in size this creature may be a bit bigger, combat is not where this will trigger.
Mutant seemed out of place for this card, but if forced to reflavor the choice wouldn't be hard.
(Not a mutant, but could be.)
I'll give you a little more you should know, a few bits of the card have been filled in below

3/4/6/8/9/12/18/19. Green and Blue, cmc less than 4.
15. Creature.
5/H1/H2/14/16/17/21. Two creature types haven't been combined before, each of which have more than 20 creatures of that type. At least one of which begins with R, S, T, L, N, or E. One is a race, the other might be a race in some cases. Not beast, mutant, or zombie
7/H4. Power 5
2. Toughness 4 or less, not 3
H3. Here's what the card looks like with every word replaced. The bracketed question marks mean there may or may not be something before "Creature"
13/17/21. Triggered ability, not ETB, doesn't trigger during combat.

???er??r??? R???????er
Creature - ??? ???
??? the ??? ??? ??? ???, ??? the ??? ??? ??? ??? ???. ??? ??'? ??? ??? ???, ??? ??? ??? ??? ???. ??? ??? CARDNAME ??? ??? ??? ??? ??? ???.
5/<5(not 3)

To kill this creature, it will take at least two pings, or a bear to block it when it swings.

3/4/6/8/9/12/18/19. Green and Blue, cmc less than 4.
15. Creature.
5/H1/H2/14/16/17/21. Two creature types haven't been combined before, each of which have more than 20 creatures of that type. At least one of which begins with R, S, T, L, N, or E. One is a race, the other might be a race in some cases. Not beast, mutant, or zombie
7/H4. Power 5
2/22. Toughness 2 or 4
H3. Here's what the card looks like with every word replaced.
13/17/21. Triggered ability, not ETB, doesn't trigger during combat.

???er??r??? R???????er
Creature - ??? ???
??? the ??? ??? ??? ???, ??? the ??? ??? ??? ??? ???. ??? ??'? ??? ??? ???, ??? ??? ??? ??? ???. ??? ??? CARDNAME ??? ??? ??? ??? ??? ???.
5/(4 or 2)

As the hint count gets bigger, it's finally revealed, the timing of the trigger.

3/4/6/8/9/12/18/19. Green and Blue, cmc less than 4.
15. Creature.
5/H1/H2/14/16/17/21. Two creature types haven't been combined before, each of which have more than 20 creatures of that type. At least one of which begins with R, S, T, L, N, or E. One is a race, the other might be a race in some cases. Not beast, mutant, or zombie
7/H4. Power 5
2/22. Toughness 2 or 4
H3. Here's what the card looks like with every word replaced.
13/17/21/23. Upkeep triggered ability

???er??r??? R???????er
Creature - ??? ???
At the beginning of your upkeep, ??? the ??? ??? ??? ??? ???. ??? ??'? ??? ??? ???, ??? ??? ??? ??? ???. ??? ??? CARDNAME ??? ??? ??? ??? ??? ???.
5/(4 or 2)

An oracle, not quite coiling? What you would draw does not need spoiling.
(It doesn't reveal the top card of your library)

3/4/6/8/9/12/18/19. Green and Blue, cmc less than 4.
15. Creature.
5/H1/H2/14/16/17/21. Two creature types haven't been combined before, each of which have more than 20 creatures of that type. At least one of which begins with R, S, T, L, N, or E. One is a race, the other might be a race in some cases. Not beast, mutant, or zombie
7/H4. Power 5
2/22. Toughness 2 or 4
H3. Here's what the card looks like with every word replaced.
13/17/21/23. Upkeep triggered ability
24. Doesn't reveal the top card of your library.

???er??r??? R???????er
Creature - ??? ???
At the beginning of your upkeep, ??? the ??? ??? ??? ??? ???. ??? ??'? ??? ??? ???, ??? ??? ??? ??? ???. ??? ??? CARDNAME ??? ??? ??? ??? ??? ???.
5/(4 or 2)