The answer ended up being Town lands and landfall
All three of Ugin's abilities play very well in Casual Land
Even if this spell gets countered you still get four cards with it, likely providing you with future answers
For example, Phyrexian was added as a creature type retroactively, which mattered a lot for cards like [[Embiggen]] in Infect decks
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It's unclear whether this was the most necessary of the Slivers, but it was the one that frustrated the most opposing plans to deal with the problem and even opened up new game plans when the card advantage resulting from saving your creatures could allow Sliver decks to go the control route when backed up by counters and removal spells