So I am currently building a Blue & White Prowess + Heroic deck in Standard. The idea that I can boost my heroic creatures with instants and auras and reap the benefit across all my prowess creatures.

Possible combo
I'm interested to know if the below combination will work. The Lotus-Eye Mystics would be in the graveyard, and then I would play Rally the Ancestors. In an ideal scenario the Rally the Ancestors would trigger the Lotus-Eye Mystics Prowess because it's an instant. Then I can return an enchantment aura back to my hand also.

Lotus Eye + Rally

I am assuming that Prowess has to be on the battlefield for the effect to trigger, which means that Rally the Ancestors would return the Lotus-Eye Mystics to the battlefield, but because they were in the graveyard when the instant was cast, the Prowess effect cannot trigger.

Is my assumption correct?

  • To cast is to put on the stack, choose targets, and pay costs. It happens "long before" the spell resolves.
    – ikegami
    Feb 9 '15 at 13:40
  • 1
    Glad to see you returned. If you want to tag a card in an answer or question, type [mtg:Card Name]. It will automatically create links to the Gatherer, just like this: Rally the Ancestors. Also, when discussing a mechanic, you can assist answerers by linking to MTGSalvation's page on that mechanic. The syntax is easy: [Prowess](http://mtgsalvation.gamepedia.com/Prowess). Finally, you might be interested in seeing how U/W Heroic is holding up in the big tournaments.
    – Rainbolt
    Feb 9 '15 at 14:48
  • I know "proc" is a word for this too, but "trigger" (as in "triggered ability") is the Magic word.
    – Cascabel
    Feb 9 '15 at 23:34

The creature with Prowess has to be on the battlefield to trigger it.

Prowess is a triggered ability that only works while the card it's printed on is on the battlefield, i.e. as long as it's a permanent. Therefore, if you return Lotus-Eye Mystics with Rally the Ancestors, the Mystics will not get the Prowess trigger from that.

You will, however, get the enters-the-battlefield trigger from the Mystics.

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