MenaceMenace is an evasion ability.
A creature with menace can’t be blocked except by two or more creatures. (See rule 509, “Declare Blockers Step.”)
Multiple instances of menace on the same creature are redundant. (CR 702.111)
Assassin spells you
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) have
freerunningFreerunning is a static ability that functions on the stack. “Freerunning [cost]” means “You may pay [cost] rather than pay this spell’s mana cost if a player was dealt combat damage this turn by a creature that, at the time it dealt that damage, was an Assassin creature or a commander under your control.” Casting a spell for its freerunning cost follows the rules for paying alternative costs in rules 601.2b and 601.2f–h. (CR 702.173) . (You may
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) a spell for its
freerunningFreerunning is a static ability that functions on the stack. “Freerunning [cost]” means “You may pay [cost] rather than pay this spell’s mana cost if a player was dealt combat damage this turn by a creature that, at the time it dealt that damage, was an Assassin creature or a commander under your control.” Casting a spell for its freerunning cost follows the rules for paying alternative costs in rules 601.2b and 601.2f–h. (CR 702.173) cost if you dealt combat damage to a player this turn with an Assassin or
commanderA designated card for a Commander deck, governed by the command-zone, color-identity, and Commander rules. (CR 903).)
Whenever Ezio deals combat damage to a player, you may pay
if that player has 10 or less life. When you do, that player loses the game.