Heliod, God of the Sun

Mana cost: {3}{W}
Type: Legendary Enchantment Creature — God
Power / toughness: 5 / 6
Set: Commander Masters #826 (mythic)
Price: $2.92 USD

Indestructible
As long as your devotion to white is less than five, Heliod isn't a creature. (Each {W} in the mana costs of permanents you control counts toward your devotion to white.)
Other creatures you control have vigilance.
{2}{W}{W}: Create a 2/1 white Cleric enchantment creature token.

Heliod, God of the Sun has 5 printings, first in Theros (2013). EDHREC ranks it #3,454 among Commander cards. It appears most in Esika, God of the Tree // The Prismatic Bridge decks (3,622 on EDHREC). 1 public deck on TCG runs it. It has 12 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: legal
standard: not legal
brawl: legal

Public decks that run Heliod, God of the Sun

Enduring Enchantments - Commander Masters, led by Anikthea, Hand of Erebos

Commanders that run Heliod, God of the Sun most

Deck counts from EDHREC.

Esika, God of the Tree // The Prismatic Bridge: 3,622 decks
Zur, Eternal Schemer: 2,829 decks
Anti-Venom, Horrifying Healer: 1,546 decks
Child of Alara: 1,404 decks
Yuna, Hope of Spira: 1,389 decks
Odric, Lunarch Marshal: 897 decks
Daxos the Returned: 699 decks
Tuvasa the Sunlit: 648 decks

Often played with Heliod, God of the Sun

Cards that show up in the same decks on EDHREC.

Rulings

2013-09-15: Numeric mana symbols ({0}, {1}, and so on) in mana costs of permanents you control don't count toward your devotion to any color.
2013-09-15: Hybrid mana symbols, monocolored hybrid mana symbols, and Phyrexian mana symbols do count toward your devotion to their color(s).
2013-09-15: If an activated ability or triggered ability has an effect that depends on your devotion to a color, you count the number of mana symbols of that color among the mana costs of permanents you control as the ability resolves. The permanent with that ability will be counted if it's still on the battlefield at that time.
2013-09-15: Mana symbols in the text boxes of permanents you control don't count toward your devotion to any color.
2020-01-24: If a God stops being a creature, it loses the type creature and the creature type God. It continues to be a legendary enchantment.
2020-01-24: The abilities of Gods function as long as they're on the battlefield, regardless of whether they're creatures.
2020-01-24: If an effect causes a God to lose all abilities, its ability that causes it to stop being a creature still applies if appropriate.
2020-01-24: As a God enters the battlefield, your devotion to its color will determine whether any replacement effects that affect creatures entering the battlefield apply to that God. Because replacement effects are considered before the God is on the battlefield, the mana symbols in its mana cost won't be counted when determining this.
2020-01-24: Counters put on a God remain on it while it's not a creature, even if they have no effect.
2020-01-24: When a God enters the battlefield, your devotion to its color (including the mana symbols in the mana cost of the God itself) will determine if a creature entered the battlefield or not for abilities that trigger whenever a creature enters the battlefield.
2020-01-24: The type-changing ability that can make a God not be a creature functions only on the battlefield. It's always a creature card in other zones, regardless of your devotion to its color. It's always a creature spell while it's on the stack.
2020-01-24: If a God is attacking or blocking and it stops being a creature, it will be removed from combat. It won't rejoin combat if it resumes being a creature later during that combat.