Cheapest priced copy (Warhammer 40,000 Commander): $0.49 at Card Kingdom, near mint, their price list as of .
Collective Effort 
Sorcery · Rare · Secret Lair Countdown · #82
Escalate—Tap an untapped creature you control. (Pay this cost for each mode chosen beyond the first.)
Choose one or more —
• Destroy target creature with power 4 or greater.
• Destroy target enchantment.
• Put a +1/+1 counter on each creature target player controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
9 printings · $0.49 to $2.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Warhammer 40,000 Commander | 183 | Rare | $0.49 | — |
| Warhammer 40,000 Commander | 183★ | Rare | — | — |
| Eldritch Moon | 17 | Rare | $0.79 | $1.49 |
| Final Fantasy Commander | 237 | Rare | $0.49 | $0.49 |
| Marvel Super Heroes Commander | 126 | Rare | $0.49 | $0.49 |
| Marvel Super Heroes Commander | 299 | Rare | $0.49 | — |
| Phyrexia: All Will Be One Commander | 61 | Rare | $0.59 | — |
| Eldritch Moon Promos | 17s | Rare | — | $2.49 |
| Secret Lair Countdown | 82 | Rare | — | — |
9 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 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 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.
- 13 July 2016If you choose the first and third modes, and destroying the creature ends an "exile until" effect (such as that of Lunarch Inquisitors), the creature will return to the battlefield before you put +1/+1 counters on creatures. The same is true if you choose the second and third modes and destroying the enchantment ends such an effect.
- 13 July 2016You can't choose any one mode multiple times.
- 13 July 2016Additional costs don't affect a spell's mana value.
- 13 July 2016You can tap any untapped creature you control to pay the escalate cost, including one you haven't controlled continuously since the beginning of the turn.
- 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 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).