Rivals of Ixalan

Baffling End | Enchantment | | When Baffling End enters the battlefield, exile target creature an opponent controls with mana value 3 or less. When Baffling End leaves the battlefield, target opponent creates a 3/3 green Dinosaur creature token with trample. | Mathias Kollros

Aquatic Incursion | Enchantment | | When Aquatic Incursion enters the battlefield, create two 1/1 blue Merfolk creature tokens with hexproof. (They can't be the targets of spells or abilities your opponents control.) {3}{U}: Target Merfolk can't be blocked this turn. | Jason Rainville

Curious Obsession | Enchantment | Aura | Enchant creature Enchanted creature gets +1/+1 and has "Whenever this creature deals combat damage to a player, you may draw a card." At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice Curious Obsession. | Daniel Ljunggren

See Red | Enchantment | Aura | Enchant creature Enchanted creature gets +2/+1 and has first strike. At the beginning of your end step, if you didn't attack with a creature this turn, sacrifice See Red. | Steve Prescott