Although the tokens created by Najeela's first ability are attacking, they were never declared as attacking creatures (for the purposes of abilities that trigger whenever a creature attacks, for example)

Ad Nauseum Aetherflux Reservoir Ancestral Recall Ancestral Statue Back to Basics Balance Baral, Chief of Compliance Biorhythm Black Lotus Braids, Cabal Minion Channel Coalition Victory Cut // Ribbons Dakmor Salvage Deadeye Navigator Debt to the Deathless Edgar Markov Ember Shot Emrakul, the Aeons Torn Erayo, Soratami Ascendant Exsanguinate Fall of the Titans Fastbond Felidar Sovereign Flash Food Chain Fraying Omnipotence Grip of Chaos Griselbrand Hermit Druid Humility Jaya's Immolating Inferno Karakas Leovold, Emissary of Trest Limited Resources Lion's Eye Diamond Mana Crypt Mana Vault Mind Twist Moat Mox Emerald Mox Jet Mox Pearl Mox Ruby Mox Sapphire Natural Order Necropotence Necrotic Ooze Oath of Druids Painter's Servant Panoptic Mirror Possibility Storm Prophet of Kruphix Protean Hulk Recurring Nightmare Rofellos, Llanowar Emissary Serra Ascendant Stasis Static Orb Strip Mine Sundering Titan Sway of the Stars Sylvan Library Sylvan Primordial Tangle Wire Test of Endurance The Chain Veil The Tabernacle at Pendrell Vale Time Vault Time Walk Tinker Tolarian Academy Tooth and Nail Torment of Hailfire Trade Secrets Treachery Triskelion Upheaval Winter Orb Worldfire Yawgmoth's Bargain Zur the Enchanter

It is not a short list nor an exhaustive one
Legality depends on the tournament format -- Storm Shaman can be legal in some formats and banned or restricted in others
Trusted Store: Avoid the risks of fake cards - shop confidently knowing we sell only real Pokmon cards
Of course, size rarity itself isnt everything