Cheapest priced copy (Commander 2018): $0.49 at Card Kingdom, near mint, their price list as of .
Daxos of Meletis 
Legendary Creature — Human Soldier · 2/2 · Rare · Commander 2018 · #173
Daxos can't be blocked by creatures with power 3 or greater.
Whenever Daxos deals combat damage to a player, exile the top card of that player's library. You gain life equal to that card's mana value. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
3 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander 2018 | 173 | Rare | $0.49 | — |
| New Capenna Commander | 335 | Rare | $0.49 | — |
| Theros | 191 | Rare | $0.49 | $1.49 |
4 rulings from Wizards of the Coast
- 15 September 2013You must pay all costs to cast the exiled card. You may pay alternative or additional costs. If the card has any mandatory additional costs, you must pay those.
- 15 September 2013If the exiled card is a land card, you won't gain any life and you won't be able to play the land.
- 15 September 2013If Daxos is blocked by a creature, raising that creature's power to 3 or greater won't change or undo the block.
- 15 September 2013Daxos doesn't change when you can cast the exiled card. For example, if you exile a creature card without flash, you can cast it only during your main phase when the stack is empty.