Sundial of the Infinite [Magic 2012] Goblin Assassin Target creature can't be blocked

Target creature can't be blocked by creatures that player controls this turn

Whenever an opponent attacks another one of your opponents

Set: Unknown Event Type: Creature — Phyrexian Knight Rarity: Common Cost: {B}{B} First Strike

Set: Dominaria Promos Type: Legendary Artifact — Equipment Rarity: Rare Cost: {4} At the beginning of combat on your turn

and Sagas are historic

Sundial of the Infinite [Magic 2012] Goblin Assassin Target creature can't be blockedSet: Magic 2012 Type: Artifact Rarity: Rare Cost: {2} {1}, {T}: End the turn. Activate only during your turn. (Exile all spells and abilities from the stack. Discard down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)