Need Siege help

Standard*

zoahed

Creature (18)

• 2x Chromanticore
• 1x Courser of Kruphix
• 4x Mantis Rider
• 3x Prophet of Kruphix
• 4x Siege Rhino
• 4x Sylvan Caryatid

Land (24)

• 1x Dismal Backwater
• 2x Forest
• 1x Frontier Bivouac
• 2x Island
• 1x Jungle Hollow
• 2x Mountain
• 1x Mystic Monastery
• 1x Nomad Outpost
• 1x Opulent Palace
• 3x Plains
• 1x Sandsteppe Citadel
• 2x Swamp
• 2x Temple of Triumph
• 1x Thornwood Falls
• 1x Tranquil Cove
• 2x Urborg, Tomb of Yawgmoth

Enchantment (7)

• 1x Banishing Light
• 3x Gift of Immortality
• 3x Skybind

Instant (7)

• 1x Empty the Pits
• 1x Hero's Downfall
• 1x Kill Shot
• 4x Sultai Charm

Sorcery (3)

• 2x Divination
• 1x Villainous Wealth

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I need some help tweaking and or fixing this deck, especially I think my mana pool. I do have some more and other dual and multi lands but I don't really want to go drop a ton on any thing else right now. Also are the skybinds and the gift of immortality both needed or would another enchant be better suited? I do have Kiora in this currently only because idk what to swap in instead. I do have a Purphoros maybe? Any help would be great. Like I said not really wanting to go buy more cards currently would like to use what I have in my current collection.

Date added	10 years
Last updated	10 years
Legality	This deck is not Standard legal.
Rarity (main - side)	3 - 0 Mythic Rares 28 - 0 Rares 10 - 0 Uncommons 4 - 0 Commons
Cards	59
Avg. CMC	3.49
Tokens	Zombie 2/2 B