The Rules Committee manages the rules of the format
A cards mana value is the total amount of mana required to play it, expressed as a single integer
In a case where you put more than one +1/+1 counter on Etched Slith with its last ability (for example, because of the effect of Doubling Season), the reflexive ability will trigger once for each +1/+1 counter you put on it this way
It is your decision on which finishers you are boarding out, depending on your play style and preferred inclusion of variance in your games, which will lead to the following boarding lines: -2 Counterspell -3 Finishers +2 Flusterstorm When youre facing off against BUG Delver, things are a little different as their suite of disruption is less aimed at your lands and spells but more on your permanents and cards in hand, which makes this matchup way easier than its previously covered cousin, as our bombs are way more likely to resolve and Senseis Divining Top acts as a way-too-good-counter to every sort of discard
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At the beginning of each player's upkeep, that player discards a card