For its magecraft ability, you will get a Treasure token on each trigger
The important part of the card though, is that it costs one less to cast for each creature on the battlefield

Description: 1 Daxos the Returned 1 Underworld Coinsmith 1 Burnished Hart 1 Dawnglare Invoker 1 Ghostblade Eidolon 1 Kor Sanctifiers 1 Monk Idealist 1 Mesa Enchantress 1 Nighthowler 1 Fate Unraveler 1 Ajani's Chosen 1 Doomwake Giant 1 Dreadbringer Lampads 1 Celestial Ancient 1 Celestial Archon 1 Treasury Thrull 1 Silent Sentinel 1 Teysa, Envoy of Ghosts 1 Karlov of the Ghost Council 1 Bastion Protector 1 Herald of the Host 1 Banshee of the Dread Choir 1 Thief of Blood 1 Oreskos Explorer 1 Corpse Augur 1 Sandstone Oracle 1 Ancient Craving 1 Gild 1 Dawn to Dusk 1 Open the Vaults 1 Death Grasp 1 Righteous Confluence 1 Deadly Tempest 1 Sol Ring 1 Wayfarer's Bauble 1 Lightning Greaves 1 Orzhov Signet 1 Crystal Chimes 1 Orzhov Cluestone 1 Thought Vessel 1 Phyrexian Reclamation 1 Seal of Cleansing 1 Grave Peril 1 Banishing Light 1 Cage of Hands 1 Karmic Justice 1 Vow of Duty 1 Fallen Ideal 1 Seal of Doom 1 Vow of Malice 1 Aura of Silence 1 Phyrexian Arena 1 Underworld Connections 1 Marshal's Anthem 1 Dictate of Heliod 1 Sigil of the Empty Throne 1 Black Market 1 Necromancer's Covenant 1 Grasp of Fate 1 Shielded by Faith 1 Daxos's Torment 1 Barren Moor 1 Command Tower 1 Evolving Wilds 1 Ghost Quarter 1 New Benalia 1 Orzhov Basilica 1 Orzhov Guildgate 1 Rogue's Passage 1 Scoured Barrens 1 Secluded Steppe 1 Tainted Field 1 Temple of the False God 1 Terramorphic Expanse 1 Vivid Marsh 1 Vivid Meadow 11 Plains 13 Swamp Description: 1 Daxos the Returned 1 Underworld Coinsmith 1 Burnished Hart 1 Dawnglare Invoker 1 Ghostblade Eidolon 1 Kor Sanctifiers 1 Monk Idealist 1 Mesa Enchantress 1 Nighthowler 1 Fate Unraveler 1 Ajani's Chosen 1 Doomwake Giant 1 Dreadbringer Lampads 1 Celestial Ancient 1 Celestial Archon 1 Treasury Thrull 1 Silent Sentinel 1 Teysa, Envoy of Ghosts 1 Karlov of the Ghost Council 1 Bastion Protector 1 Herald of the Host 1 Banshee of the Dread Choir 1 Thief of Blood 1 Oreskos Explorer 1 Corpse Augur 1 Sandstone Oracle 1 Ancient Craving 1 Gild 1 Dawn to Dusk 1 Open the Vaults 1 Death Grasp 1 Righteous Confluence 1 Deadly Tempest 1 Sol Ring 1 Wayfarer's Bauble 1 Lightning Greaves 1 Orzhov Signet 1 Crystal Chimes 1 Orzhov Cluestone 1 Thought Vessel 1 Phyrexian Reclamation 1 Seal of Cleansing 1 Grave Peril 1 Banishing Light 1 Cage of Hands 1 Karmic Justice 1 Vow of Duty 1 Fallen Ideal 1 Seal of Doom 1 Vow of Malice 1 Aura of Silence 1 Phyrexian Arena 1 Underworld Connections 1 Marshal's Anthem 1 Dictate of Heliod 1 Sigil of the Empty Throne 1 Black Market 1 Necromancer's Covenant 1 Grasp of Fate 1 Shielded by Faith 1 Daxos's Torment 1 Barren Moor 1 Command Tower 1 Evolving Wilds 1 Ghost Quarter 1 New Benalia 1 Orzhov Basilica 1 Orzhov Guildgate 1 Rogue's Passage 1 Scoured Barrens 1 Secluded Steppe 1 Tainted Field 1 Temple of the False God 1 Terramorphic Expanse 1 Vivid Marsh 1 Vivid Meadow 11 Plains 13 Swamp Company: Wizards of the Coast Series: 2015 Commander Item Type: Deck Brand: Magic The Gathering Release Date: November 2015 UPC: 634746376398 Stock #: 112269 Our Guarantees to You, Our Valued Customer

If you give a creature vigilance twice, this doesnt make any difference
Even outside of the combo potential, Wilhelt, the Rotcleaver seems like a powerful addition to the roster of Zombie commanders and might very well be one of the more popular additions
Ten of those bad boys and you lose the game