Any aspect of the card, from its attribute, typing, stats, or even lack of effect could be the difference between it being mediocre and an important combo bridge
Special Summon 1 "Mimighoul Master" from your hand, Deck or GY
Drawing cards while you hit land drops off Ramunap Excavator or while you cycle through creatures with Tortured Existence and Phyrexian Reclamation is a disgusting amount of card advantage, even if it only triggers once per turn
During the End Phase, if this card was Special Summoned this turn: Return it to the hand
Isochron Scepter can't imprint Far // Away or Bound // Determined
While it may not sound too terrifying, simple and free draws have been shown to be the easiest way to absolutely break the card game wide open, more so in modern Yu-Gi-Oh