Shaggy, The Boundless

As an additional cost to cast Shaggy,
The Boundless, discard you hand and sacrifice all permanents you control. You lose half of your
life points, rounded down.
When Shaggy, The Boundless enters the battlefield, choose a player. When Shaggy, The Boundless deals combat damage to that player,
repeat the "as an additional cost" effect on them.
Haste, trample, shroud, indestructible