Here are a few typal tutors that can help you improve the typal game plan of your deck

Gallery and List of Foretell Cards Alrund's Epiphany Augury Raven Battle Mammoth Behold the Multiverse Cosmic Intervention Cosmos Charger Crush the Weak Delayed Blast Fireball Demon Bolt Depart the Realm Doomskar Doomskar Oracle Doomskar Titan Dual Strike Dwarven Reinforcements Frost Fair Lure Fish Glorious Protector Gods' Hall Guardian Green Slime Haunting Voyage Impending Flux Iron Verdict Jarl of the Forsaken Kaya's Onslaught Lifestream's Blessing Lupine Harbingers Mammoth Growth Mystic Reflection Poison the Cup Quakebringer Ravenform Return Upon the Tide Rise of the Dread Marn Sage of the Beyond Sarulf's Packmate Saw It Coming Scorn Effigy Shepherd of the Cosmos Skull Raid Sozin's Comet Spectral Deluge Starnheim Unleashed Stoic Farmer Struggle for Skemfar Surge of Brilliance Tales of the Ancestors Tergrid's Shadow The Foretold Soldier Ultimate Magic: Holy Ultimate Magic: Meteor Vengeful Reaper Warhorn Blast Best Foretell Cards #10

Four players mean the range of gameplay possibilities expands massively so being prepared for everything is hugely important
Aatchik, Emerald Radian Amzu, Swarm's Hunger Ant Queen Ant-Man, Colony Commander Beacon of Creation Canoptek Scarab Swarm Crawling Infestation Crawling Sensation Deadly Grub Dragonlair Spider Eumidian Hatchery Fumulus, the Infestation Giant Caterpillar Grist, the Hunger Tide Grist, the Plague Swarm Hiveheart Shaman Hornet Cannon Infestation Expert Infestation Sage Infested Roothold Iridescent Hornbeetle Izoni, Thousand-Eyed Lord Dregg, Insect Invader Megaflora Jungle Old Rutstein One Dozen Eyes Phyrexian Swarmlord Scouring Swarm Scute Swarm Springheart Nantuko Swarm Shambler The Hive The Hunger Tide Rises The Locust God Trigon of Infestation Vilespawn Spider Vitality Charm Wirefly Hive Wirewood Hivemaster Xira, the Golden Sting

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As for Atarka she maybe a little too powerful in dragon deck maybe make focus on creature with power four or greater since temur like those (a minor improvement since like 97% of dragons are 4 or higher) and instead of counters make it a firebreathing effect?, instead of just creatures maybe something like this "Whenever you draw a card dragons you control gain +1/+0 until the end of the turn" "Whenever a creature with power four or greater enters the battlefield under your control draw a card than discard a card, if this creature was cast from your hand instead Scry 1 and Draw a card" this way if you cheat a monster onto the field you still get the draw but you have to discard, but if you cast it from your hand it rewards you with more utility (you have blue use more of it)