What formats is this legal in?

Unknown* Counters RG (Gruul)

ChocolateChara

Creature (16)

• 1x Arni Brokenbrow
• 1x Colossal Dreadmaw
• 1x Cragplate Baloth
• 4x Dauntless Survivor
• 1x Dragonsguard Elite
• 3x Grumgully, the Generous
• 3x Red Dragon
• 1x Towashi Guide-Bot
• 1x Webspinner Cuff

Instant (18)

• 2x Plummet
• 1x Return to Nature
• 4x Run Amok
• 4x Shock
• 1x Tamiyo's Safekeeping
• 4x Volcanic Geyser
• 2x Volcanic Upheaval

Sorcery (7)

• 1x Explosive Entry
• 1x Goatnap
• 3x Rabid Bite
• 2x Thundering Rebuke

Land (22)

• 8x Forest
• 1x Gruul Turf
• 10x Mountain
• 2x Shivan Oasis
• 1x Slagwoods Bridge

Enchantment (4)

• 1x Arni Slays the Troll
• 1x Curse of Predation
• 1x Death's Presence
• 1x Tales of Master Seshiro  ^Flip

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I’m a pretty new MTG player and I made a deck out of cards my friend gave me and some cards from the Precon decks I bought. I have a question about this deck though, what formats is it legal in? I’m pretty sure about standard but not so sure about modern or other formats.

Update (Aug 2nd 2022): Will be updating to make it legal in Standard!

Date added	3 years
Last updated	3 years
Legality	This deck is Unknown legal.
Rarity (main - side)	4 - 0 Rares 19 - 0 Uncommons 26 - 0 Commons
Cards	67
Avg. CMC	2.80