Scarlet Spider, Ben Reilly 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
Web-slinging(You may cast this spell for
if you also return a tapped creature you control to its owner's hand.) Trample Sensational Save — If Scarlet Spider was cast using web-slinging, he enters with X +1/+1 counters on him, where X is the mana value of the returned creature.
Complete guide
Scarlet Spider, Ben Reilly swings onto the battlefield with a unique mobility mechanic known as Web-slinging. This allows you to deploy him for a lower mana cost while simultaneously saving a valuable creature from your field. By returning a teammate to your hand, you empower Ben with additional strength through his Sensational Save ability.
Understanding Web-slinging
Web-slinging is an alternative cost that you may choose to pay instead of the normal mana cost of {1}{R}{G}. To use this cost, you must pay {R}{G} and return a tapped creature you control to its owner's hand as you cast the spell. This return happens as part of paying the cost, meaning the creature is off the battlefield before Scarlet Spider even hits the stack. You cannot combine Web-slinging with other alternative costs, such as casting a spell for free.
Resolution and Counters
When Scarlet Spider, Ben Reilly enters the battlefield, the game checks if his Web-slinging cost was paid. If it was, the Sensational Save ability triggers, placing a number of +1/+1 counters on him equal to the mana value of the creature you returned. To determine X, use the mana value the creature had while it was last on the battlefield. Note that if the returned creature had {X} in its mana cost, that X is considered zero for this calculation.
Timing and Tapping
The creature you return must be tapped at the moment you pay the cost. Interestingly, you can use a creature's mana ability to help pay for the {R}{G} cost and then immediately return that now-tapped creature to satisfy the Web-slinging requirement. You must still follow all normal timing rules; unless you have another effect granting Flash, you can only cast Scarlet Spider during your main phase while the stack is empty.
When to Play Him
Scarlet Spider is best utilized when you have a creature with a high mana value that has already provided value or is being targeted by an opponent's removal. Since he has Trample, the +1/+1 counters from Sensational Save make him a formidable threat that can push damage through blockers easily.
Interaction examples
If you have a Solemn Simulacrum on the battlefield that is tapped (perhaps after attacking), you can cast Scarlet Spider for his Web-slinging cost of {R}{G}. By returning Solemn Simulacrum to your hand, Scarlet Spider enters the battlefield with 4 +1/+1 counters because the Simulacrum's mana value is 4. You now have a 7/7 Trampler and the Golem back in your hand to recast later for another land.
You can tap Sakura-Tribe Elder for mana if an effect allows it, or simply ensure it is tapped by other means. If you return Sakura-Tribe Elder to your hand to pay for the Web-slinging cost, Scarlet Spider will enter with 2 +1/+1 counters. Note that you cannot sacrifice the Elder to find a land and return it to your hand at the same time; once it is sacrificed, it is no longer on the battlefield to be returned.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Scarlet Spider, Ben Reilly
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Use the mana value of the creature as it last existed on the battlefield to determine the value of X. If it had
in its mana cost, X is 0 when determining its mana value.
No other card is named in this ruling.
- #2· Wizards of the Coast
If any permanent has an ability that triggers when the permanent you return leaves the battlefield, that ability will be put on the stack after you finish casting the spell, and it will resolve before that spell.
No other card is named in this ruling.
- #3· Wizards of the Coast
You must follow all normal timing rules when casting a spell with web-slinging. For creatures, that usually means you must cast it during a main phase of your turn while the stack is empty.
No other card is named in this ruling.
- #4· Wizards of the Coast
The creature you return must be tapped at the time you pay costs, but doesn't necessarily need to be tapped before you start casting the spell. For example, if you tap a creature with a mana ability to pay part of the spell's web-slinging cost, you could also return that creature to your hand to pay the cost.
No other card is named in this ruling.
- #5· Wizards of the Coast
Web-slinging represents an alternative cost. If another effect allows you to play a card for a different alternative cost, including "without paying its mana cost," you can't also choose to pay its web-slinging cost. If any additional costs from other sources are applied, you must pay those.
No other card is named in this ruling.
Legal formats
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Solemn Simulacrum
Sakura-Tribe Elder