In blue, cards like Kindred Discovery, Bident of Thassa, and Coastal Piracy turn your tokens into steady card draw whenever they enter or deal damage
In decks like Ad Nauseam + Tendrils, the card is used either to get enough storm count by drawing free spells or to find your Tendrils of Agony win condition
It took years of writing Spreading Seas hate mail to encourage control enthusiasts to cut the card and thankfully, Field of Ruin helped expedite that process
It can also be the hardest to keep up with because of its nature, as only a handful of sets are legal in Standard in MTG at a time, and some rotate out each year
Sacrifice after III.) I, II, III Choose one at random Combine Powers
Lifegain for lifegains sake is usually bad, and cards that provide pure lifegain usually aren't playable