Cheapest priced copy (Bloomburrow Commander): $9.99 at Card Kingdom, near mint, their price list as of .
Twenty-Toed Toad 
Creature — Frog Wizard · 3/3 · Rare · Bloomburrow Commander · #16
Your maximum hand size is twenty.
Whenever you attack with two or more creatures, put a +1/+1 counter on this creature and draw a card.
Whenever this creature attacks, you win the game if there are twenty or more counters on it or you have twenty or more cards in hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $9.99 to $11.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Bloomburrow Commander | 16 | Rare | $9.99 | — |
| Bloomburrow Commander | 51 | Rare | $11.99 | — |
| The List | BLC-16 | Rare | $9.99 | — |
3 rulings from Wizards of the Coast
- 26 July 2024Your maximum hand size is only checked during the cleanup step of your turn. At other times, you may have more cards in hand than your maximum hand size.
- 26 July 2024If multiple effects modify your hand size, apply them in timestamp order. For example, if you put Twenty-Toed Toad onto the battlefield and then put Spellbook (an artifact that says you have no maximum hand size) onto the battlefield, you would have no maximum hand size. However, if those permanents entered in the opposite order, your maximum hand size would he twenty.
- 26 July 2024Twenty-Toed Toad's last ability will trigger whenever it attacks, no matter how many counters are on it or cards you have in your hand at that time. The number of counters on it and the number of cards in your hand are only checked when that ability resolves.