Secret Lair Drop

Treasure

Big Score

Instant

As an additional cost to cast this spell, discard a card.
Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

Copy

Sorcery

Create a token that's a copy of target creature, except it has haste and "At the beginning of the end step, exile this token."

Heat Shimmer

Enchantment

At the beginning of each player's upkeep, this enchantment deals 1 damage to them.
Whenever a player casts a spell, if no mana was spent to cast that spell, this enchantment deals 5 damage to that player.
{R}: Your opponents can't gain life this turn.