While Celestine can trigger herself using her lifelink ability, she's best used in a deck that has other means of gaining life as you can then take advantage of her Healing Tears ability the turn she enters the battlefield
Or at least thats what I read it as
These cards shouldn't be counted directly as lands, but three copies of Elvish Mystic can be a fine reason to play, say, sixteen lands instead of seventeen or eighteen in your 40-card Limited deck

Aberrant Return Abhorrent Overlord Absorb Vis Abzan Devotee Accursed Horde Accursed Witch Acid-Spewer Dragon Aclazotz, Deepest Betrayal Acolyte of Aclazotz Acolyte of Xathrid Adorned Crocodile Adventurous Eater Aether Poisoner Aetherborn Marauder Afflict Afterlife from the Loam Agate-Blade Assassin Age of Ultron Agent Venom Agent of the Iron Throne Agent of the Shadow Thieves Agents of HYDRA Aggressive Negotiations Aggressive Symbiosis Agonizing Demise Agonizing Remorse Aku Djinn Al Bhed Salvagers Alchemist's Assistant Alchemist's Gift Alien Symbiosis Altar of Bhaal Altar of Bhaal Ambitious Aetherborn Ambulatory Edifice Ammit Eternal Ancestral Vengeance Ancient Cellarspawn Andradite Leech Animate Dead Aphelia, Viper Whisperer Appendage Amalgam Arcbound Condor Archenemy's Charm Archfiend of Ifnir Archpriest of Shadows Arguel's Blood Fast Armor Thrull Armor of Shadows Arnim Zola, Bio-Fanatic Arnyn, Deathbloom Botanist Arrogant Bloodlord Ascendant Evincar Ashenmoor Cohort Ashiok, Wicked Manipulator Aspect of Gorgon Assassin Initiate Assassin's Ink Astarion's Thirst Asylum Visitor Attempted Murder Audacious Thief Auntie's Snitch Avenger of the Fallen Ayara's Oathsworn Ayara, First of Locthwain Azra Smokeshaper Azula Always Lies Azula, On the Hunt Azula, Ruthless Firebender Back on Track Bad Moon

This is one of the options for you if youre building a green creature-based Commander deck on a budget
Investment Thesis Ultra Prism balances collectible appeal with investment potential, offering multiple chase cards and a stable market presence