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One-card searches that turn singleton variance into deterministic toolboxes Demonic Tutor, Vampiric Tutor, Mystical Tutor, and the rest

The card has a ton of homes, in other words, and its not just an extender for combos as it is in constructed formats

Either idea works but not every card would make both versions

Replacement effects that modify the number of counters being placed on creatures you control, such as the effect of Branching Evolution, apply to this ability as normal

And do you need to keep some RadAway on hand just in case

Well, Wizards intended for this ability to work only when Rukh Egg died and went to the graveyard from the battlefield