So far all of the Mesmer’s phantasm conjuring skills do just that: conjure a phantasm. The iCapAmerica is the first to break the mold where the skill itself also does something. Personally, I think this should be done for all phantasm skills. So, for example:
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Phantasmal Berserker: Send an illusionary greatsword whirling towards your target, damaging and crippling all foes in a line. When the greatsword reaches its maximum range, a phantasm appears and grabs the greatsword to continue the attack (phantasm will not attack until its attack CD is finished).
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Phantasmal Warlock: Weave a malicious spell that extends the duration of conditions on your target, then conjure a phantasm next to you that deals bonus damage for each unique condition on your target.
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Phantasmal Swordsman: You leap in and stab your target with your sword while evading attacks. Conjure a phantasm that will leap out with you, then continue the attack (phantasm will not attack until its attack CD is finished).
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Phantasmal Duelist: Fire a bullet at your target that Confuses them, then conjure a phantasm next to you that will unload on your target.
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Phantasmal Warden: Create a shield bubble at the target location that destroys all projectiles for a short duration. Conjure a phantasm within the shield that will run to your target and whirl to destroy projectiles.
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Phantasmal Mage: Throw an illusionary torch at the target location that explodes, Burning enemies and giving Fury to allies within the area. Conjure a phantasm at the epicentre against your target that will Burn foes and grant Fury to allies (phantasm will not attack until its attack CD is finished).
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Phantasmal Defender: grant Protection to yourself and allies around you, then conjure a phantasm behind your target that redirects some damage suffered by nearby allies to itself.
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Phantasmal Disenchanter: blast the target location with dampening magic, cleansing conditions from allies and stripping boons from enemies. Conjure a phantasm at the epicentre against your target that will cleanse conditions from allies and strip boons from enemies (phantasm will not attack until its attack CD is finished).
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Phantasmal Mariner: You teleport behind your target and stab them repeatedly with your spear while evading attacks. Conjure a phantasm that will evade out with you, then continue the attack (phantasm will not attack until its attack CD is finished).
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Phantasmal Whaler: Mark a target for the hunt, making them Vulnerable; then conjure a phantasm next to you that will Bleed your target with a flurry of harpoons.
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Phantasmal Rogue: Immobilise your target, then conjure a phantasm that will stab them in the back; dealing double damage.
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I’m pretty conservative here, mostly mirroring the phantasm’s own attacks so as to not introduce too much new stuff. I’m sure others will have more interesting ideas.