So I'm making a commander meme deck based around Kumano, Master Yamabushi. I was wondering how many damage doubling effects are there in mono-red. The current ones I can think of are: Furnace of Rath, Dictate of the Twin Gods, Angarath's Marauders, and Gratuitous Violence. The goal of the deck is, along with Heartstone, be able to one shot people for just a red with Kumano. I would welcome any other suggestions for ways to increase Kumano's damage output or decrease the cost.
Magic: the Gathering has highly standardised ways to word its effects, so when you see an effect you like and want to find more of it, you should search for the words you find in the effect that look like they're fairly unique to that effect. (Recognising which words those are can take some experience.)
You can search in either Gatherer (the official search engine), or a third party search engine like Scryfall or MagicCards.info. I find these second two are far easier to compose searches in. I'm going to be referencing Scryfall below since it's my personal favorite.
If you search only for
o:"double that damage" (within a color identity of red, and within the Commander format) you'll find 17 damage doubling effects.
The following don't actually work for your commander:
- Charging Tuskodon and Goblin Charbelcher only double their own damage.
- Fire Servant won't interact with Kumano.
- Blind Fury, Impulsive Maneuvers, and Inquisitor's Flail only interact with combat damage (which won't count Kumano's ability).
We can eliminate the ones that definitely don't work from the search results by name for our perusal.
By my count there are 10 (11 if you count the double-printed card as two).
You can find them when you follow this link.
You can use the Gatherer to search for such cards, as shown here.