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Which one you use largely depends on what you think is least likely to get removed

I see Sinkhole Surveyor as a beater that can get out of cheap removal range fast, and with some Bloomburrow bats around, the life loss is somewhat relevant

You may cast any number of legendary sorceries in a turn, and your deck may contain any number of legendary cards (but no more than four of any with the same name)

After all, Torch of Defiance provides the same effects of card advantage, mana ramp, and consistent ping damage

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However, While Wulfgar costs five mana and only doubles triggers based on its controller's creatures attacking, Isshin costs two less mana whilst also doubling triggers that may care about an opponent's creatures attacking, making Isshin simultaneously more flexible and more efficient of an option