Infiltrate vs other games
When an entity with Infiltrate attacks, your opponent can’t use Defender to redirect the attack. Responses still work, and so does Taunt, since Taunt limits which targets you may pick. When Scarlett attacks, you may give it Infiltrate and +1 attack; if you do, it is sacrificed at the end of the turn.
Is it like…
“Your opponent cannot activate [Blocker]” in One Piece TCGYes
Yes. Infiltrate does what One Piece’s “your opponent cannot activate [Blocker]” does: the attack goes where you aimed it, unless a counter or response stops it.
What’s the same and what’s different“Can’t be blocked” in Magic: The GatheringPartly
Partly. An unblockable Magic creature always hits the player, planeswalker or battle it attacked. An Infiltrate attacker can’t be redirected by Defender, but it still picks a legal target, and Taunt still applies.
What’s the same and what’s differentElusive in Legends of RuneterraPartly
Partly. An Elusive unit can still be blocked by other Elusive units. Nothing can redirect an Infiltrate attack with Defender.
What’s the same and what’s different