To understand the efficacy of Tera Pokemon, lets distill the strongest Tera-boosting cards and how it is they make this solid Tera Box deck not only strong, but potentially the very strongest deck post rotation
These two abilities actually work really well together, as the mana ability will give you the necessary resources to play the three cards you just exiled off the top of your library
The cards on the list are as follows: Drannith Magistrate Enlightened Tutor Serras Sanctum Smothering Tithe Trouble in Pairs Cyclonic Rift Expropriate Force of Will Fierce Guardianship Rhystic Study Thassas Oracle Urza, Lord High Artificer Mystical Tutor Jin-Gitaxias, Core Augur Bolass Citadel Demonic Tutor Imperial Seal Opposition Agent Tergrid, God of Fright Vampiric Tutor Ad Nauseam Jeskas Will Underworld Breach Gaeas Cradle Survival of the Fittest Vorinclex, Voice of Hunger The One Ring Trinisphere Chrome Mox Grim Monolith Lions Eye Diamond Mox Diamond Mana Vault Ancient Tomb Glacial Chasm The Tabernacle at Pendrell Vale Kinnan, Bonder Prodigy Yuriko, The Tigers Shadow Winota, Joiner of Forces Grand Arbiter Augustin IV To reiterate, these cards are not in any way banned
Handicap - that downside to consistency can be used as a handicap against less experienced players, to create a more even playing field so everyone can enjoy a more casual game
Of course, just being granted an enchanted version of a card does not guarantee that the card is going to be strong or even frequently used
No matter if its a Magikarp or a Mewtwo, the brand demands astronomical prices