Cheapest priced copy (March of the Machine: The Aftermath): $3.49 at Card Kingdom, near mint, their price list as of .
Tranquil Frillback 
Creature — Dinosaur · 3/3 · Rare · March of the Machine: The Aftermath · #24
When this creature enters, you may pay {G} up to three times. When you pay this cost one or more times, choose up to that many —
• Destroy target artifact or enchantment.
• Exile target player's graveyard.
• You gain 4 life.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
5 printings · $2.99 to $4.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| March of the Machine: The Aftermath | 24 | Rare | $3.49 | $2.99 |
| March of the Machine: The Aftermath | 74 | Rare | $3.49 | $3.49 |
| March of the Machine: The Aftermath | 124 | Rare | — | — |
| March of the Machine: The Aftermath | 164 | Rare | $4.49 | $3.99 |
| March of the Machine: The Aftermath | 204 | Rare | — | $4.49Out of stock |
One ruling from Wizards of the Coast
- 12 May 2023Tranquil Frillback's triggered ability goes on the stack with no targets and no modes chosen. As it resolves, you may pay {G} up to three times. That is, you may pay {G}, {G}{G}, {G}{G}{G}, or choose not to pay. If you chose to pay, the second "reflexive" triggered ability will trigger. You'll choose the modes and targets, if any, for that second ability at that time.