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Though spells and abilities that are exiled won't get a chance to resolve, they don't count as being "countered." If Sundial of the Infinite's ability is activated before the end step, any "at the beginning of the end step"-triggered abilities won't get the chance to trigger that turn because the end step is skipped

That being said I'd keep this card for slower formats, since it'll take at least two turns before it outputs more mana than it takes to activate its ability

Silvar provides you with a wide selection of Black and Red sacrifice effects, whilst Trynn lets you access all of the Humans available in White

The Shield Sphere was the 0-cost drop of choice over other options (such as Phyrexian Walker) because of how well it could provide early defense