Moon-Circuit Hacker — Opponent can activate ninjutsu without paying mana

[matthewevans]

Reported in Discord: https://discord.com/channels/1485498006781427802/1524167102137892984/1524167102137892984

Thread: Moon-Circuit Hacker
Discord thread id: 1524167102137892984
Discord message id: 1524167102137892984
Cards: moon-circuit hacker
Parser status: fully_parsed
Extraction confidence: manual

Summary

My opponent keeps putting ninjutsu activations on the stack without spending mana.

Oracle text (verified from client/public/card-data.json)

Moon-Circuit Hacker

Ninjutsu {U} ({U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, you may draw a card. If you do, discard a card unless this creature entered this turn.

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_{report_id: discord:1524167102137892984:1524167102137892984:0 · discord: 1524167102137892984/1524167102137892984}