[RPG] If the Haste spell is cast on a Bladesinging wizard, can the Bladesinger cast three cantrips in a turn using the Extra Attack feature

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If the haste spell is cast on a Bladesinging wizard, can the Bladesinger cast three cantrips in a turn using the Extra Attack feature?

For instance, say I'm a level 6 Bladesinging wizard, with haste already active. Can I do all of the following on the same turn?

  1. Cast booming blade to attack a target 5 feet from me
  2. Forego my second attack to cast shocking grasp
  3. (a) Use the additional action granted by haste to cast
    infestation

All 3 spells are cantrips.

Alternately, can I do steps 1 and 2 above, then:

  1. (b) use my additional action from haste to cast misty step
    (instead of infestation)

In this case, it's 2 cantrips and a bonus-action spell.

I've read a lot about reaction spells from War Caster, or Action Surge spells, or Quickened Spells from a sorcerer, but I haven't heard if it's ok to load up my turn with cantrips as a Bladesinger with haste, as per my 2 examples above.

Best Answer

In order:

Cast Booming Blade to attack a target 5 feet from me

Yes. There's no issue here.

Forego my second attack to cast Shocking Grasp

This will not work. Per the rules on the Bladesinging wizard's Extra Attack feature (Tasha's Cauldron of Everything, pg. 76):

Starting at 6th level, you can attack twice, instead of once, whenever you take the Attack action on your turn. Moreover, you can cast one of your cantrips in place of one of those attacks.

Casting a cantrip doesn't count as "taking the Attack action" – even if, in the course of performing that cantrip, you make an attack against a creature and roll an attack roll.

Use my action from Haste to cast Infestation

The action granted from Haste doesn't allow you to cast spells (Player's Handbook, pg. 250):

[...] it gains an additional action on each of its turns. That action can be used only to take the Attack (one weapon attack only), Dash, Disengage, Hide, or Use an Object action.

Use my action from Haste to cast Misty Step.

Sort of. You can't use an action to cast a bonus-action spell. So the action granted by Haste doesn't allow you to cast Misty Step (also, again, that action can't be used to cast spells).

However, as established already, the only other spell(s) cast this turn were cantrips, so you are legally allowed to use a bonus action to cast Misty Step this turn, regardless of the presence of Haste.

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