Lands wise were a little sketchy on 36, with a 78% chance to see three of them by Turn 3
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Dionus, Elvish Archdruid gives them a significant buff with its counters, which stick around if your opponents answer Dionus, and you get a huge mana boost off untapping Elvish Archdruid and similar cards
If it sticks on the battlefield, any creature entering the battlefield will trigger it to dome the opponent, or scorch a creature equal to the entering creature's power
Yes, it lets you search out a basic land every time you attack (which is twice every turn for Karlach), but it also removes lands from your deck, making it more likely to draw cards that will have a greater impact on the game later on
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