To get all the full details on the system, check out the article over on our sister site EDHREC
Summon: Yojimbo Summon: Yojimbo would rank better if it stopped creatures from attacking more
Both are pretty standard card advantage engines, though they go about earning you value in very different ways
If you have fetchlands, you can trigger the effect multiple times a turn, causing massive burn with extra copies

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In the highly competitive cattle feed industry, profitability is determined long before the product reaches the farmer