Although Innocent Blood is technically a more potent removal spell the ability to target Tragic Slip makes it actually useful and scale well into the late game where Blood typically becomes less effective
Examining the prices for the special art variants in MTG Aetherdrift, its clear that these ideas actually are widespread
The constant Do you pay the one? trigger can become a psychological tool to wear down your opponents patience
Wild Magic Surge This two-mana instant is next
Creature - Human Wizard Color tag templates(None) Drogskol Reaver Flying Double strike (This creature deals both first-strike and regular combat damage.) Lifelink (Damage dealt by this creature also causes you to gain that much life.) Whenever you gain life, draw a card
Thats a lot of hoops to jump through just to get a legend onto the field, but at least it lasts until your next turn, so cards like Jin-Gitaxias, Progress Tyrant have a whole round to punish your opponents before they revert back to whatever they were