If you were worried about a literally-twice-as-expensive Oblivion Ring being too oppressive, never fear: you can only activate that ability at sorcery speed once
Itll be particularly interesting to see how Hidden String impacts other Arena formats, however
Incentivizing your opponents to attack each other is welcome, but it just means you have less life total to deal with yourself
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
Perhaps it's a way to represent levelled-up magic, like the Thunder-Thundara-Thundaga progression that black mages use
Speaking of disruption, Peak Eruption is a good rate land-destruction spell in an era with very few