Whether evoke's sacrifice ability triggers when the creature enters the battlefield depends on whether the spell's controller chose to pay the evoke cost, not whether they actually paid it (if it was reduced or otherwise altered by another ability, for example)
(It also ran Arcane Laboratory so your foe, and yourself, couldn't cast more than one spell per turn)
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Repeatedly triggering Dowsing Device's ability is great, but its backside ability can turn one of your creatures into a deadly force
Sacrifice effects in general are absolutely fantastic with Rograkh
This is some great blue tempo, that strives to be the commander of a deck full of cheap flying faeries, but who also works well in any generic horror deck