Rule breach
When a player attacks with Squee the Dubious Monarch, an attacking creature token is created. This creature token's attack is not registered by the game with regards to Witchstalker Frenzy's casting cost.
Even after the attack, the amount of mana needed to cast Witchstalker Frenzy is not reduced by the attack of the creature token.
It should be.
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Rezzahan#77802 commented
No, that is correct. A creature that's put on the field attacking, is attacking, but never attacked. A creature attacks if it is DECLARED AS ATTACKER during the declare attackers turn based action in the declare attackers step.
508.4. If a creature is put onto the battlefield attacking, its controller chooses which defending player,
planeswalker a defending player controls, or battle a defending player protects it’s attacking as it
enters the battlefield (unless the effect that put it onto the battlefield specifies what it’s attacking).
Similarly, if an effect states that a creature is attacking, its controller chooses which defending
player, planeswalker a defending player controls, or battle a defending player protects it’s attacking
(unless the effect has already specified). Such creatures are “attacking” but, for the purposes of
trigger events and effects, they never “attacked.”