FOILCheapest priced copy (Fallout): $4.49 at Card Kingdom, foil, near mint, their price list as of .
Caesar, Legion's Emperor 
Legendary Creature — Human Soldier · 4/4 · Mythic · Fallout · #1
Whenever you attack, you may sacrifice another creature. When you do, choose two —
• Create two 1/1 red and white Soldier creature tokens with haste that are tapped and attacking.
• You draw a card and you lose 1 life.
• Caesar deals damage equal to the number of creature tokens you control to target opponent.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $4.49 to $129.99 at Card Kingdom
2 rulings from Wizards of the Coast
- 8 March 2024You don't choose modes or a target for Caesar, Legion's Emperor's ability at the time it triggers. Rather, a second "reflexive" ability triggers when you sacrifice another creature this way. You choose modes and, if you chose the third mode, a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
- 8 March 2024The Soldier tokens created by Caesar's ability enter the battlefield tapped and attacking, but since they weren't declared as attacking creatures, no abilities that trigger whenever a creature attacks or whenever you attack (such as Caesar's own ability) will trigger.