Trinisphere is a bit more suspect, since its a pretty oppressive Stax piece, but Wizards justified the move by claiming that it tends to be strongest at the highest power levels. Philosophy 101 Theres a lot to take in with this MTG Game Changers update
Chapter III in particular makes attacking feed you cards, so sometimes Shiva plays out like two turns of Moat. You can also try to combine this with other stun effects to draw extra cards, though there arent many of those (mostly just Ice Flan and Omega, Heartless Evolution)
Its a reasonably straightforward mechanic with the odd second thing gets the trigger idea used in the second card drawn ability introduced in War of the Spark on Jace, Arcane Strategist but fleshed out on seven cards in the next premiere set, Throne of Eldraine
(2022-04-29) You don't have to attack with the creature with blitz unless another ability says you do
These are the four main rarities, though there are a handful of other types that show up from time to time
Ideally, it's great to have a whole mechanic or two that can do it