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Bone Shards gives you more synergistic removal

A 3/3 vampire with flying and lifelink for six mana, when The Haunt of Hightower attacks, the defending player discards a card

Casting multiple spells per turn gets out of hand incredibly fast

In order for it to generate advantage, we need to already have stuck a big creature on the board

First of all, when Regisaur Alpha enters the battlefield you create a 3/3 green dinosaur creature token with trample, so it's like getting two creatures for the price of one

It's -1 to its toughness, which is worse than Animate Dead ($0.99 and 34,592 decks at EDHREC.com) which is only just -1 to power and has the same cost as Persist