If damage that can't be prevented is dealt to Gideon, Champion of Justice after his second ability has resolved, that damage will have all applicable results: specifically, the damage is marked on Gideon (since he's a creature) and that damage causes that many loyalty counters to be removed from him (since he's a planeswalker). Even though he has indestructible, if Gideon, Champion of Justice has no loyalty counters on him, he's put into his owner's graveyard as a state-based action.
Say you activate Gideon, Champion of Justice's second ability, and then an opponent gains control of him before combat. You may have any of your creatures attack Gideon, Champion of Justice (since he's still a planeswalker). Then Gideon, Champion of Justice may block (since he's a creature). He may block any eligible attacking creature, including one that's attacking him! During combat, he behaves as an attacked planeswalker and/or a blocking creature, as appropriate. For example, he deals combat damage to any creatures he's blocking, but he doesn't deal combat damage to any unblocked creatures that are attacking him.
Last observed on Scryfall 2 months ago at $2.47. Over the trailing 90 days the price moved between $0.02 and $2.47 across 49 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from GTC — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #13 of *Gatecrash*, the set that shipped alongside the February 2013 Gatecrash release.
Card type: Legendary Planeswalker — Gideon, color identity white, printed at mythic. Mythic rares historically land in roughly one out of every eight boosters at standard print densities. Mana cost: {2}{W}{W} (4 converted).
Legal in Pioneer, Modern, Legacy, Vintage, and Commander.
EDHrec ranks this card #13,486 in Commander, putting it in the fringe-play tier of the format's playable pool.
Illustrated by David Rapoza. Rarix catalogs 266 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. David Rapoza
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Gideon, Champion of Justice's second ability causes him to become a creature with the creature types Human and Soldier. He remains a planeswalker with the planeswalker type Gideon. (He also retains any other card types or subtypes he may have had.) Each subtype is correlated to the proper card type: Gideon is just a planeswalker type (not a creature type), and Human and Soldier are just creature types (not planeswalker types).
You put a loyalty counter on Gideon, Champion of Justice as part of the cost of activating the first ability. When that ability resolves, you count the number of creatures controlled by the target opponent and put that many additional loyalty counters on Gideon.
Gideon, Champion of Justice's power and toughness are set to the number of loyalty counters on him when his second ability resolves. They won't change later in the turn if the number of loyalty counters on him changes.
If the first ability doesn't resolve (perhaps because the target opponent is an illegal target when the ability tries to resolve), you won't put any additional loyalty counters on Gideon, although the loyalty counter you put on him to activate the ability will remain.
If Gideon, Champion of Justice becomes a creature due to his second ability, that doesn't count as having a creature enter. Gideon was already on the battlefield; he only changed his types. Abilities that trigger whenever a creature enters won't trigger.
If Gideon, Champion of Justice becomes a creature the same turn he enters, you can't attack with him or use any of his {T} abilities (if he gains any).
