Thanks for the response. good thing I didn't cast it then haha

Whatever's on top of the stack resolves first. So, if you cast March in response to Kaya's Wrath, your tokens will resolve first and fill the board, and then the Kaya's Wrath will resolve afterwards and wipe them all out immediately.

  
[Unbreakable Formation](https://img.scryfall.com/cards/normal/front/4/6/46cc8574-7b8c-492c-8a36-75cb0192f853.jpg?1549413997) - [(G)](http://gatherer.wizards.com/Pages/Card/Details.aspx?name=Unbreakable%20Formation) [(SF)](https://scryfall.com/card/rna/29/unbreakable-formation?utm_source=mtgcardfetcher) [(txt)](https://api.scryfall.com/cards/46cc8574-7b8c-492c-8a36-75cb0192f853?utm_source=mtgcardfetcher&format=text)  
^^^[[cardname]] ^^^or ^^^[[cardname|SET]] ^^^to ^^^call

Yeah you want [[Unbreakable Formation]] in that situation. MotM will be a total waste in that situation. Whichever is activated last completely resolves first.

  
[Unbreakable Formation](https://img.scryfall.com/cards/normal/front/4/6/46cc8574-7b8c-492c-8a36-75cb0192f853.jpg?1549413997) - [(G)](http://gatherer.wizards.com/Pages/Card/Details.aspx?name=Unbreakable%20Formation) [(SF)](https://scryfall.com/card/rna/29/unbreakable-formation?utm_source=mtgcardfetcher) [(txt)](https://api.scryfall.com/cards/46cc8574-7b8c-492c-8a36-75cb0192f853?utm_source=mtgcardfetcher&amp;format=text)  
^^^[[cardname]] ^^^or ^^^[[cardname|SET]] ^^^to ^^^call

So, I played a match recently with Selesnya Tokens and I had a board filled with untapped tokens. My opponent plays Kaya's Wrath. If I cast March of the Multitudes, will the tokens spawn after or before Kaya's Wrath resolves?

Question about spell resolution