There are two big reasons to run these cards: Firstly, 5 manas the going rate for an extra turn with no strings attached
Perhaps it's a way to represent levelled-up magic, like the Thunder-Thundara-Thundaga progression that black mages use
Its likely that future renditions will bring in newer 4 Diamond rarity cards from sets not included here, but well have to wait and see when the Pokemon TCG Pocket team announces the next one to know for sure
Speaking of disruption, Peak Eruption is a good rate land-destruction spell in an era with very few
Indestructible Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.) When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library
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