No other card in Magic does what Dread Return does, and it's considered to be so broken that Wizards put it on the initial Modern ban list, where it remains to this day
And what cards really surprised with how much fun they generated
Altar of the Brood, Gimli of the Glittering Caves, Molten Gatekeeper, Vigilante Justice, Witty Roastmaster, Outpost Siege, Pandemonium DemonDragonJ on Double Trouble 1 year ago I have replaced Molten Gatekeeper with Agate Instigator, which reduced the average converted mana cost of this deck from 3.82 to 3.81, because the instigator has a stronger synergy with this deck than did the gatekeeper.
While many of the cards in the Transcendasaurus archetype are flawed, this card is not one of them, and it is useful in a variety of Dinosaur-type decks