If my deck works I should be able to reliably see creatures dying, so I'm running Tragic Slip as a 1 mana answer to problem creatures that are indestructible
Once the ability resolves, the bonus applied by that instance of the ability doesn't change even if the number of permanent cards in your graveyard changes
Players will rank their experience level and play one-on-one games with players at a similar experience level to them using Welcome Decks
Additionally, in order to have Siphoner work against creature decks, you need those creatures to be off the battlefield
Card evaluation is not an exact science, but for Sealed, players want to prioritize bombs that can actively help win the game, removal spells that can help deal with opponents' threats, and aggressive creatures that will ensure that players get on the board early and prevent their opponent from running away with the game