Cheapest priced copy (Innistrad Remastered): $0.49 at Card Kingdom, near mint, their price list as of .
Collective Defiance 
Sorcery · Rare · Eldritch Moon · #123
Escalate {1} (Pay this cost for each mode chosen beyond the first.)
Choose one or more —
• Target player discards all the cards in their hand, then draws that many cards.
• Collective Defiance deals 4 damage to target creature.
• Collective Defiance deals 3 damage to target opponent or planeswalker.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 123 | Rare | $0.59 | $1.49 |
| Innistrad Remastered | 149 | Rare | $0.49 | $0.49 |
| Breaking News | 21 | Rare | $0.49 | $0.49 |
| Eldritch Moon Promos | 123s | Rare | — | $0.79 |
7 rulings from Wizards of the Coast
- 13 July 2016Effects that reduce the cost of spells reduce the total cost, including any escalate costs added.
- 13 July 2016If an effect allows you to cast a spell that has escalate without paying its mana cost, you pay escalate costs for that spell if you choose more than one mode.
- 13 July 2016Additional costs don’t affect a spell’s mana value.
- 13 July 2016You choose all of your modes at once. You can’t wait to perform one mode’s actions and then decide to choose more modes.
- 13 July 2016You can’t choose any one mode multiple times.
- 13 July 2016If two of the chosen modes of an escalate spell target a creature, you may choose the same creature for each mode’s target, or choose different creatures. The same is true if the chosen modes target a player (or opponent).
- 13 July 2016If one target of an escalate spell becomes illegal, the other targets will still be affected. If all of the targets become illegal, the spell won’t resolve.