Cheapest priced copy (Eldritch Moon): $0.35 at Card Kingdom, near mint, their price list as of .
Savage Alliance 
Instant · Uncommon · Eldritch Moon · #140
Escalate {1} (Pay this cost for each mode chosen beyond the first.)
Choose one or more —
• Creatures target player controls gain trample until end of turn.
• Savage Alliance deals 2 damage to target creature.
• Savage Alliance deals 1 damage to each creature target opponent controls.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Eldritch Moon | 140 | Uncommon | $0.35 | $0.49 |
| Innistrad Remastered | 169 | Uncommon | $0.35 | $0.49 |
9 rulings from Wizards of the Coast
- 13 July 2016You can't choose any one mode multiple times.
- 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 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 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 2016When determining how much damage a creature with trample may assign to the player or planeswalker it's attacking, take into account damage that has already been dealt to the blocking creatures. For example, a 4/4 creature with trample blocked by a 4/4 creature with 2 damage marked on it may assign 2 damage to that creature and 2 damage to the defending player.
- 13 July 2016If you choose the second and third modes, and the targeted creature is controlled by the targeted opponent, that creature will take 2 plus 1 damage for a total of 3 damage. An ability that triggers whenever that creature is dealt damage will trigger twice.
- 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 2016Effects that reduce the cost of spells reduce the total cost, including any escalate costs added.
- 13 July 2016Additional costs don't affect a spell's mana value.