yugioh card sleeves and deck box UAONO for MTG, 100+ Deck Case with 2 Dividers, PU Leather Storage Box, Compatible with Collectible Trading Cards (Black & Red, Sky Dragon) : Toys & Games instantly converting any surface into your personal battlefield HENWEI PP Deck Box 300+

Setting up live at corporate functions, expos and parties, to professional portrait upgrades at the office

JohannaEncourages creative play

Card not found from Legions (2003) is an interesting tribal card in that its actually worse when you have more of its brethren

So unless there is some pattern where similar cards appear to be rarer or more common, or the sample size is a lot larger, brute force wont deliver definitive answers (though it is still interesting of course)

If Golden-Tail Trainer's power changes after costs are locked in, or if Golden-Tail Trainer leaves the battlefield while you are activating mana abilities or paying those costs, the cost reduction effect won't be affected and the total cost to cast the spell won't change