Chromie performs decent on most maps with the exception of Battlefield of Eternity. On this battleground, Chromie's lack of sustained single target damage can cause your team to have a substantial disadvantage during Immortal battles. On Towers of Doom, on the other hand, her outstanding poke, which allows her to dominate Altars from afar, makes Chromie a force to be reckoned with.

Sylvanas is a highly contested pick on all Maps that feature Objectives that provide you with a pushing force, as Black Arrows's Structure disabling effect greatly increases the longevity and effectiveness of such pushing forces. Her Barbed Shot Talent also turns her into one of the most effective Heroes at taking down Monsters (such as the Immortal on Battlefield of Eternity) and Mercenaries, further increasing her drafting priority on Maps that feature these elements.

Kharazim's Support Build focuses on AoE healing and last-second saves using Divine Palm. Since Kharazim usually has to expose himself more than other Supports in order to heal nearby allies, playing this Build requires a keen eye and swift reflexes. Casting Radiant Dash, in particular, on allies in need can really challenge your micro-management skills at times, which makes Support Kharazim a quite challenging yet rewarding experience.

Try to use Frostbolt, Blizzard, Cone of Cold together to maximise the damage you deal with Frostbite.
Slow enemies before casting Blizzard so that it is easier to land both waves.
Summon a Summon Water Elemental just prior to a fight so that you can position it correctly.

The Healing Build is a good template to use when you are the only Support on your team. It is unmatched by the other builds in healing potential, because it has many Talents invested into Healing Brew. This build is designed to sustain Mana as long as possible, while constantly casting powerful Healing Brews. Jug of 1,000 Cups can be used for quick healing if necessary, or you can hold it to use when you are low on Mana. It is ideal to cast Jug of 1000 Cups while you have full Spell Power stacks from Surging Winds, although this is not always be possible.