Radagast of Rhosgobel is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
The first creature spell you cast each turn costsless to cast and can be cast as though it had flash.
Complete guide
Radagast of Rhosgobel is a powerful Legendary Avatar Wizard that brings the speed and efficiency of the forest to your deck. By providing a significant mana discount and the ability to cast creatures at any time, he transforms your game plan into a reactive and explosive strategy.
Masters of the Forest: How It Works
Radagast provides a static ability that modifies the very first creature spell you cast during every single turn. This includes your own turns and your opponents' turns! The first creature spell you attempt to cast receives a {2} generic mana discount and gains a temporary form of Flash, meaning you can cast it whenever you could cast an instant. Note that this ability only reduces generic mana requirements; you must still pay all colored mana symbols in the spell's cost.
Step-by-Step Resolution
When you decide to cast your first creature spell of the turn, follow these steps: First, announce the spell and place it on the stack. If the spell has an X in its cost, you choose the value of X now. Second, determine the total cost by starting with the mana cost or alternative cost, adding any cost increases (like commander tax), and finally subtracting the {2} discount from Radagast. Third, once the cost is paid, the spell is officially cast. Because Radagast grants the ability to cast it as though it had flash, you can do this even during an opponent's combat phase or at the end of their turn.
Common Pitfalls
The most important rule to remember is that Radagast counts himself. If you cast Radagast of Rhosgobel as your first creature spell of the turn, he does not reduce his own cost, and you cannot use his ability to cast another creature with a discount that same turn. Additionally, the ability looks at the entire turn's history. If you cast a creature spell earlier in the turn before Radagast entered the battlefield, his ability will recognize that a creature has already been cast and will not apply to any subsequent creature spells you try to cast that turn.
Strategic Timing
To maximize Radagast, you should aim to cast one creature on each player's turn. This effectively allows you to utilize his {2} mana discount multiple times in a single round of play. Since the first creature spell gains flash, you can wait until the last possible second—such as an opponent's end step—to deploy a threat while keeping your mana open for interaction or blocks during their turn.
Interaction examples
Solemn SimulacrumIf Solemn Simulacrum is the first creature spell you cast in a turn, its cost is reduced from {4} to {2}. Furthermore, you can cast it during an opponent's turn to surprise them with a blocker and search for a land to ramp for your upcoming turn.
Eternal WitnessWhile Eternal Witness costs {1}{G}{G}, Radagast's discount only applies to generic mana. Therefore, you reduce the {1} to {0}, but you must still pay {G}{G}. Because it gains flash, you can cast the Witness on an opponent's turn to immediately return a crucial card from your graveyard to your hand in response to an effect.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Radagast of Rhosgobel
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Radagast of Rhosgobel's ability will look at the entire turn, even if Radagast wasn't on the battlefield for some of it. Notably, if you cast Radagast of Rhosgobel in a turn, then no other creature spell you cast that turn can be your first.
No other card is named in this ruling.
- #2· Wizards of the Coast
Radagast of Rhosgobel's ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you actually pay.
No other card is named in this ruling.
- #3· Wizards of the Coast
If the first creature spell you cast in a turn has
in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if the first creature spell you cast in a turn has a mana cost of 
, you could choose 2 as the value of X and pay to cast the spell.No other card is named in this ruling.
- #4· Wizards of the Coast
The first creature spell you cast each turn doesn't necessarily have to be the first spell you cast. You could cast a sorcery spell and then cast a creature spell that would get the discount.
No other card is named in this ruling.
- #5· Wizards of the Coast
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect, apply those increases before applying cost reductions.
No other card is named in this ruling.
- #6· Wizards of the Coast
Radagast's ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic component of that cost.
No other card is named in this ruling.
- #7· Wizards of the Coast
The cost reduction can apply to alternative costs.
No other card is named in this ruling.
Legal formats
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