I am not simply talking about additional cost, or else then something like Magic Mirror would fall into the Passive category
If you can drop the Sentinel on an early turn, most players arent going to be interested in holding their ramp spells in order to pay your tax
If youre also a lifegain tilt machine like me, I hope you use these tools to turn your frown upside down
9 Marvel's Spider-Man Play Boosters (14 cards per booster) 15 Traditional Foil basic lands (including 5 featuring full art) 15 nonfoil basic lands (including 5 featuring full art) Oversized Spindown life counter 2 reference cards 1 deck box Play Boosters may contain these cards: SPM 1231

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Once I understood my deck well enough, I started building my own sideboards, not just changing a card here or there but building from the ground up