mtg tardis card Magic The Gathering - Universes Beyond - Doctor Who Idris has all activated and triggered abilities of the exiled card and gets +X/+X TARDIS | Universes Beyond: Doctor

While all of this worked, Magic was designed around Standard

How It Plays: Take command of the battlefield with Vivi Ornitier

The answer lies in scarcity, both in the form of the products themselves and the rare drop bonus card, Encore Electromancer, a variant of Conclusion Reflecting on the overall delivery, availability, and concept of these cards, I feel this idea has fizzled out rather quickly and ineffectively

1 Fleecemane Lion

If Aang's Iceberg leaves the battlefield before the activated ability resolves, you will be unable to sacrifice Aang's Iceberg and will not scry, even if Aang's Iceberg was sacrificed via a different ability while its activated ability was on the stack

Not to mention, if you actually did have another two-mana instant, you could wait and see if you needed to cast your other card instead