Cheapest priced copy (Guilds of Ravnica): $0.35 at Card Kingdom, near mint, their price list as of .
Ral's Staticaster 
Creature — Lizard Wizard · 3/3 · Uncommon · Guilds of Ravnica · #268
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Whenever this creature attacks, if you control a Ral planeswalker, this creature gets +1/+0 for each card in your hand until end of turn.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Guilds of Ravnica | 268 | Uncommon | $0.35 | — |
2 rulings from Wizards of the Coast
- 5 October 2018The number of cards in your hand is checked only as the triggered ability of Ral’s Staticaster resolves. If that number changes later in the turn, its power is unaffected.
- 5 October 2018Whether you control a Ral planeswalker is checked as the ability triggers and as it resolves. After it has resolved while you controlled a Ral planeswalker, Ral’s Staticaster keeps the bonus for the rest of the turn even if you lose your planeswalker.