You control another creature that can attack this turn and that cannot be blocked by an opponent.
You have a creature card in hand.
Notable Prerequisites
Creatures you control can tap to produce at least .
Steps
Declare any other creature as an attacker.
When that creature isn't blocked, activate any number of creatures you control by tapping them, adding at least .
Activate a creature card's ninjutsu ability by paying and returning the unblocked attacker to your hand, putting the creature card from your hand onto the battlefield tapped and attacking.
When the creature enters the battlefield,
Intruder Alarm triggers, untapping all creatures.
Repeat from step 2.
Results
Infinite creature LTB.
Infinite creature ETB.
Infinite mana creatures you control can produce.
Infinite untap of creatures.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.