Harper, the beginning

When Harper, the beginning enters the battlefield, restart the game, discard your hand, then draw seven cards.
At the beginning of your upkeep you may pay {3}, if you do, then your opponent discards three cards.
{t}Put a legend counter on Harper, the beginning.
Whenever you would cast a spell from your hand, it costs {x} less to cast where X is the number of legend counters on Harper, the beginning.