The closest paper comparison is something like Obsidian Fireheart, which uses a specific kind of counter to 'remind' you about the effect even if the creature dies
And if you've mentally repressed all math-related knowledge, the only fraction you can choose is 1/2 (and yes, 1 1/2, 2 1/2, etc
One of the game's best control cards is Espathra ex, and it can often shut down decks because of its Dazzling Gaze ability
After that I would focus on Generation Next for Floodgate
Preventing all combat damage that would be dealt to artifact creatures under its owners control, Losheel decks can be quite aggressive with their artifact creatures with very little risk
Rather than just handing players a deck of cards and rules separately, the starter set blends the two together, presenting a fully playable tutorial designed to run two players - or one person controlling two decks, if needs be - through the basics