Cheapest priced copy (Tenth Edition): $0.49 at Card Kingdom, near mint, their price list as of .
Chimeric Staff 
Artifact · Rare · Tenth Edition · #313
{X}: This artifact becomes an X/X Construct artifact creature until end of turn.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.49 to $1.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Tenth Edition | 313 | Rare | $0.49 | $1.49Out of stock |
| Urza's Saga | 288 | Rare | $0.59 | — |
2 rulings from Wizards of the Coast
- 1 August 2008A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.
- 1 October 2009If Chimeric Staff is already an artifact creature when you activate its ability, Chimeric Staff stays an artifact creature but the ability resets its creature types. You always apply the effect from this card before counters or other effects that modify power and toughness. For example, if you pay {3} to make it a 3/3, then someone gives it -1/-1, it will be a 2/2. If you then activate the ability with {4}, you will apply the "4/4" effect before the -1/-1 effect, so the end result will be a 3/3. Damage that was dealt to the creature stays on it.