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The Grandeur ability helps you make Tarox temporarily bigger

You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter to

After using this strategy as a baseline, play a lot of games and take a lot of notes

That helps to actually reach the top end of your mana curve, rather than simply losing the game because you kept drawing the expensive cards that you couldnt castwhat we usually call mana screw. Its also worth mentioning that landcycling abilities do count as cycling for the purposes of cards like Jo Grant that trigger whenever you cycle. Also, since discarding the card is the cost and the tutoring is the ability, any abilities that trigger when you discard a card like Inti, Seneschal of the Sun trigger and resolve after you discard the card but before you search your library