What affects the value of Phyrexian Arena
This game was only released in Japan back in 2001, so it is unlikely that many players even knew about this Angel before the Secret Lair finally printed it as a physical card
Thats not to say it isnt doable, but the more lands you have in your deck that dont produce White, the worse a card like Anti-Venom becomes

1 Bright-Palm, Soul Awakener 1 Shalai and Hallar 1 Death-Greeter's Champion 1 Uncivil Unrest 1 Ichor Elixir 1 Mirror-Style Master 1 Guardian Scalelord 1 Emergent Woodwurm 1 Path of the Pyromancer 1 Conclave Sledge-Captain 1 Kalonian Hydra 1 Mikaeus, the Lunarch 1 Canopy Vista 1 Champion of Lambholt 1 Cinder Glade 1 Dromoka's Command 1 Exotic Orchard 1 Flamerush Rider 1 Flameshadow Conjuring 1 Forgotten Ancient 1 Fortified Village 1 Furycalm Snarl 1 Game Trail 1 Gavony Township 1 Genesis Hydra 1 Gyre Sage 1 Heaven /// Earth 1 High Sentinels of Arashin 1 Incubation Druid 1 Inscription of Abundance 1 Ion Storm 1 Kessig Wolf Run 1 Krenko, Tin Street Kingpin 1 Managorger Hydra 1 Mossfire Valley 1 Mosswort Bridge 1 Restoration Angel 1 Rishkar, Peema Renegade 1 Semester's End 1 Strionic Resonator 1 Sungrass Prairie 1 Sunscorch Regent 1 Temple of Abandon 1 Temple of Plenty 1 Temple of Triumph 1 Together Forever 1 Triskelion 1 Command Tower 1 Commander's Sphere 1 Cultivate 1 Evolving Wilds 1 Fertilid 1 Fractured Powerstone 1 Kodama's Reach 1 Path of Ancestry 1 Pridemalkin 1 Return to Nature 1 Terramorphic Expanse 1 Wood Elves 1 Abzan Battle Priest 1 Abzan Falconer 1 Alharu, Solemn Ritualist 1 Arcane Signet 1 Armorcraft Judge 1 Brawn 1 Bretagard Stronghold 1 Conclave Mentor 1 Constable of the Realm 1 Elite Scaleguard 1 Enduring Scalelord 1 Falkenrath Exterminator 1 Field of Ruin 1 Generous Gift 1 Good-Fortune Unicorn 1 Hamza, Guardian of Arashin 1 Hindervines 1 Inspiring Call 1 Jungle Shrine 1 Juniper Order Ranger 1 Krosan Verge 1 Llanowar Reborn 1 Mindless Automaton 1 Rogue's Passage 1 Slurrk, All-Ingesting 1 Sol Ring 1 Swords to Plowshares 1 Temple of the False God 5 Plains 2 Mountain 6 Forest Call for Backup Planechase Cards Call for Backup Tokens 2 Spirit (white) // Treasure tokens 4 Goblin // Sliver tokens 1 Elephant // City's Blessing token 3 Butterfly // City's Blessing tokens Spirit (white) // Treasure (Defender) Goblin // Sliver Elephant // City's Blessing Butterfly // City's Blessing TINKER TIME Gimbal, Gremlin Prodigy and Rashmi and Ragavan are traditional foil cards

These are genuine errors from the stamping process and command modest premiums among variant collectors