Because of these cards rarities, their price tag is on the level of Black Lotus
Theres a lot of established heuristics on this subject, and a few points I can toss in to help you construct an optimal mana base for Standard, Modern, Pioneer, or whatever MTG format you prefer
Sample Upheaval Deck | Odyssey Constructed | Abe Sargent Creatures (4) 4 Psychatog Instants (18) 2 Memory Lapse 2 Recoil 2 Repulse 4 Aether Burst 4 Counterspell 4 Fact or Fiction Sorceries (14) 3 Chainer's Edict 3 Deep Analysis 4 Duress 4 Upheaval Lands (24) 10 Island 10 Swamp 4 Salt Marsh This is a common control deck that uses Upheaval to delay the game and then drops the Psychatog to win
Other cards with Turbo Shark Cards by Nurikabe Frequently Asked Questions How can I obtain the Mega Sharpedo ex with 2-Stars rarity from the Ruler of the Skies set
Another strategy against Mew ex is feeding it a tanky card with minimum damage
Its performance in the market isnt merely a function of its age but of its pivotal role in shaping the landscape of the hobby