Tefryx, The Scarlet Scaled

First strike, flying, haste
Tefryx has indestructible as long as you control
seven or more Treasure tokens.
Whenever a dragon you control attacks, choose
one that hasn't been chosen yet this turn —
• Tefryx deals 7 damage to each opponent.
• Discard your hand, then draw seven cards.
• Create seven Treasure tokens.