Epistolary Librarian is an excellent go-wide payoff, using Veil of Time to cast spells from your hand without paying their mana costs if youre attacking with enough creatures
Mazirek, Kraul Death Priest is a five-mana 2/2 flyer that grants every creature you control a +1/+1 counter whenever a creature gets sacrificed
Then no one can cast things from their graveyards and I don't have any flashback or other cards that would do that, just the Regrowths mentioned
If they are playing multiple cards together as a single action or effect, they can choose the order in which the cards activate
(Whenever another Merfolk you control becomes the target of a spell or ability an opponent controls, counter it unless that player pays .) Legendary Creature - Merfolk God Commander (CTRL to add secondary) Anthem Anthem (CTRL to add secondary) Creature Creature (CTRL to add secondary) Draw Mystic Remora Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays
But retargeting effects won't work against Ensnared by the Mara or The Master, Gallifrey's End since there are no targets to redirect
