Teferi, Time Raveler is your most dangerous obstacle — his static ability prevents Violent Outburst from functioning at instant speed, so counter him immediately with Mystical Dispute or Force of Negation before he can stick. Force of Vigor comes in primarily to answer Deafening Silence post-board, which would completely disable your cascade engine; leaving home without an answer is too risky. Brotherhood's End is your main sweeper against their token-generating creatures like Ocelot Pride and Guide of Souls, which can build a threatening board faster than you can cascade through it. Fire/Ice is trimmed because this matchup is interactive and grindy enough that its marginal utility isn't worth the slot, and Gemstone Caverns comes out since you don't need the speed acceleration in a slower, answer-heavy game.