With Insight, which might be the superior card in many cases, there will be boatloads of card drawing
Orvar, the All-Form - This one's got a lot of people excited
You have loads of ways to trigger this in the Necrons deck itself, particularly all of the cards that have unearth, but youll find even more ways to do this in a dedicated deck
You can do the end of turn trick here, where you activate the ability on the end step right before your turn and keep the dragon you tutored until your end step
Im partial to stax builds that generate huge surges of mana thanks to cards like Mardu Shadowspear and Night Market Lookout to power out disruptive tools like God-Pharaoh's Gift and Altar of Bone, which grinds the game to a standstill until you begin summoning Eldrazi from the Blind Eternities
This comfy-ness can relieve some of your cognitive load, or just allow you to have a more relaxed experience achieving a goal