I'm pretty sure that an obscure promo card is not a pillar of the game.
inb4 the new promo is actually called Pillar
It's a combination of Pillage and Cellar.
Pillar
$5 Action-Attack
+1 Action
Each other player with 5 or more cards in hand reveals his hand and then discards as many cards from his hand that you choose. He then draws that same number of cards.
That could be a really annoying card. Not possession annoying, but still.
Nonterminal? That would easily be the most dickish card in Dominion. Possession, Minion, and Pillage wouldn't even come close.