Cheapest priced copy (Ravnica Allegiance): $0.35 at Card Kingdom, near mint, their price list as of .
Clan Guildmage 
Creature — Human Shaman · 2/2 · Uncommon · Ravnica Allegiance · #162
{1}{R}, {T}: Target creature can't block this turn.
{2}{G}, {T}: Target land you control becomes a 4/4 Elemental creature with haste until end of turn. It's still a land.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Ravnica Allegiance | 162 | Uncommon | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 25 January 2019Clan Guildmage’s second ability doesn’t untap the land that becomes a creature.
- 25 January 2019Activating Clan Guildmage’s first ability after a creature has blocked won’t remove the blocking creature from combat or cause the creature it blocked to become unblocked.