Heroes Evolved Mobile: Best hero to spend the shards?

In Heroes Evolved Mobile, a shard is an in-game currency that lets you buy heroes. The heroes are namely: Nightshade, Pyrrhus, Lotus and Vince.

It's not easy to gather shards, so you have to be wise in spending it. First, you have to pick your playstyle, are you all for ranged, melee, carry, disabler, support? Of course, you have to maximize your playstyle so you could pick a hero to spend the shards with. You will know your playstyle the time when your shards are ready for purchase.

Nightshade

A melee, carry and ganker hero, similar to Dota 2's Anti-Mage hero. This is best used to counter mages or heroes with relatively high mana in-game.

Skills:

• Eclipse - each melee attack burns your enemy's mana, the mana burn is also your damage. It can slow your opponent's movement speed.
• Silent Phantom - a short distance (900 range when maxed) teleportation to a target position.
• Night Slayer [Ultimate] - nightshade takes mark and hunts her pray, dealing 400 (maxed) damage + Target's lost mana x 0.4
• Hourglass - Permanently increase attack and power and spell resist. Making Nightshade tanky against spellcasters. It has a 10 second cooldown and is passive.

Pyrrhus

A ranged, pusher and nuker hero.

Skills:

• Banishment - banishes enemy heroes towards a targeted area that slows their movement speed by 50% and cannot make attacks. The banished heroes received 33% less physical damage but suffers 33% extra magical damage.
• Ball of Fire - draws on arcane solar knowledge turning into a huge meatballs that slowly rolls toward a targeted direction, dealing continuous damage  (460 damage per second when maxed) to enemies that are hit by its path.
• Enflame [Ultimate] - this hero sets the battlefield ablaze, firing a flaming arrow in a targeted area and erecting a fiery wall for 5 seconds. Deals damage per second (400 when maxed) and unit affected by the skills suffers magic damage and movement speed slow.
• Magic Conversion - this hero converts its mana into magical damage that stacks with its current normal range attack with 165 (maxed) bonus damage.

Lotus

A ranged, disabler and nuker hero that uses its guitar sound to deal damage to enemies.

Skills:

• Spring Blossoms - a buff that heals Lotus and up to 2 allies (220 when maxed) in a 900 radius, also granting extra damage (300 when maxed) in next attack.
• Waltz of the Lark - deals magical damage (310 when maxed) to 5 random enemy units in a 900 radius around Lotus, also granting 80 movement speed to herself and up to 2 allies. Lotus' next attack will slow the enemy hero targeted movement speed (45% when maxed) for 3 seconds.
• Phoenix Rising [Ultimate] - Lotus plays phoenix rising, placing her in stasis for 2.5 seconds which renders her immovable and invincible (meaning, it will not take damage from any attack). Nearby enemy movement speed is slowed by 50% and after Lotus plays her song, enemies within the radius will suffer magical damage (900 when maxed) and are stun for 1 second.
• Mystical Melody - Plays a mystical melody to deal magical damage (350 when maxed) at any enemy hero, while confusing the target for 1.2 seconds.

Vince

A ranged, pusher and carry hero similar to the Gyrocopter hero in Dota 2.

Skills:

• Missile Launcher - Launches a missile at a target enemy unit, dealing physical damage (200 when maxed). If the enemy  unit is hit by the missile again within 8 seconds from the first missile, it will take bonus damage (200 maxed) and movement speed slow by 30%.
• Rocket Launcher - Launches a rocket at any target direction, dealing magic damage (360 when maxed) and stunning the first enemy unit hit for 1 second. Vince will be knocked back for 500 range due to the recoil.
• Speed Glider [Ultimate] - Grants Vince 30% bonus movement speed, 500 vision range and 500 attack range., while the cast range of Missile Launcher is also increased by 500. This skill lasts 8 seconds when maxed out.
• Increased Firepower - Vince increases its firepower, causing his next normal attack to deal bonus damage to his target. It has a 3-second cooldown and is not affected by any cooldown reduction bonuses.