I think it's a cool game that requires us to use our intelligence and creativity
Yet Another Aether Vortex: This enchantment has an ability that counters spells unless their controller pays 1 for each spell they've cast this turn
Demonstrate is an ability with a huge number of potential applications, and by granting it every turn, the Twelfth Doctor will quickly facilitate a very busy board, growing more powerful with counters all the while

Each Set Booster contains fifteen cards, with plenty of opportunities for opening multiple rares and mythic rares, including multiple legends: 1 Foil-etched legendary creature or Background (rare or mythic rare in 1 of 3 boosters) 1 Legendary creature or planeswalker (rare or mythic rare in 50% of boosters) 1 Legendary Background (rare in 1 of 12 boosters) 1 Rare or mythic rare (this can be legendary or non-legendary) 1 Traditional foil card of any rarity, including Booster Fun cards 1 Common or uncommon card with the rulebook treatment 1 Basic land or foil basic land 3 Common cards that are connected thematically 3 Uncommon cards that are connected thematically 2 Wildcards of any rarity 1 Art card or foil-stamped art card 1 Token, ad card, helper card, or a card from The List Set Boosters are available individually and in displays of 18 boosters
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Note that this works on abilities that would counter your spells not just spells like Mystic Snake