By itself, in the meta, although the main penguin card can be hybrid into so many other decks.

Monster:
Ash Blossom & Ghost Ogre X3
Barrier Statue of the Stormwinds
Dimension Shifter X3
Mist Valley Apex Avian
Raiza the Mega Monarch
Flunderereeze X Eaglen X3
Flundereeze X Robina X3
Necroface
Flundereeze X Empen X2
Flundereeze & Toccan
Dark Simorgh
(20)
Spells:
Messenger of Peace
Mystic Mine
Pot of Desires X3
Terraforming
Pot of Extravagance X3
Flundereeze and the Magnificent Map X3
Flundereezeand the Unexplored Winds
Gold Sarcophagus
Pot of Duality
One For One
Moon Mirror Shield
Pot of Prosperity
Harpie’s Feather Duster
(19)
Traps:
Flundereeze and the Dreaming Town
(1)
(40)
Extra
Link
Linkuriboh
Relinquished Anima
Luster Soldier – Soldier of Chaos
Tri-brigade Ferrigit the Barren Blossom
Tri-rigade Bearbrumm the Rampant Rampager
Tri-brigade Rugal the Silver Sheller
Tri-brigade Shuriag the Ominous Omen
(7)
Xyz
Lyrilusc – Assembled Nighingale
Lyrilusc – Recital Starling X2
Divine Arsenal AA-ZEUS – Sky Thunder
Dowerd Magician
Gauntlet Launcher
Number F0: Utopic Future
Number F0: Utopic Draco Future
(8)
Combos
Flundereeze X Robina to X Eaglen then the main boss card Flundereeze X Empen works nearly every time with all the extra negate cards to use. Then when the penguin is on the field, all your opponent’s monsters in attack mode that were specially summoned cannot activate their effects. Plus got an inbuilt raise attack similar to Moon Mirror Shield.
Dark Simorgh, Mist Valley Apex Avian, Raiza the Mega Monarch are the second-best cards in the deck since all the spell cards require you to mill the extra deck.
Including Pot of Desires, so remember the Gold Sarcophagus, Necroface combo to ensure getting all those banished cards back in the deck. Dimension Shifter helps with that or can be discarded for other card effects.
https://www.patreon.com/GROOVYGORDS
https://entertainmentcultureonline.com/