All of this is to say that Oko is extremely hard to answer in combat, so it largely requires a spell to deal with it (or, as we see in Throne of Eldraine Standard, you can go way over the top of its threat generation by, for example, making lots of 2/2s with Field of the Dead)
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As card #184 in a set with 132 printed cards, it sits in the secret-rare numbering pulled less often than anything in the regular checklist
Heres an example of a Pauper deck combining Dread Return and Lotleth Giant
It is a fine blocker and sometimes trades up to three drops, but also makes a formidable aggressive threat that can deal quite some damage early on
Whenever one or more tokens you control enter, draw a card