mtg is legendary a card type Magic lead designer announces new coming in “future set” MTG card types explained -

This card will likely see most of its play in formats like Brawl, thanks to the longer game time allowing for larger creatures to be played, thus offering more potent uses of Burning Anger

Not things to just throw into decks willy nilly

Legendary Creature - Wizard Orc Draw (CTRL to add secondary) Finisher Overpowering Attack Freerunning (You may cast this spell for its freerunning cost if you dealt combat damage to a player this turn with an Assassin or commander.) Untap all creatures you control that attacked this turn

When this land enters untapped, create a Food token

All sorts of disruption will prevent Skullclamp providing any card advantage as will poor deck design