Crystal Maiden + Keeper of the Light

Why this works

Having both of these heroes on one team lets your cores play a faster game. Keeper of the Light’s Chakra Magic is already useful for letting a hero spam spells, but stacking it with the team-wide regeneration from Crystal Maiden's Arcane Aura means your key heroes almost never run out of mana. Carries can use their abilities to clear waves and jungle camps constantly, accelerating their farm without needing to ship out consumables or return to base. Active mid heroes can keep harassing their opponent and pushing the lane, controlling runes and creating pressure.

This resource advantage can build a small but steady lead. Your team can group to take objectives earlier, since everyone is more likely to be ready to fight. It puts the burden on the enemy team to be proactive; they have to find pickoffs to slow down your farm or force fights when your important spells aren't ready. The lane combo itself isn't particularly threatening, but the economic boost it gives your whole team from the start of the game often makes things a little bit easier down the road.