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Today, its a bit more complicated

A battle happens from the point you declare you wish to attack, and thus any effect that prevents cards from being activated at the point of a battle starts cannot be activated, see the first example below for how to write that kind of effect

The term finally got officially keyworded in Core Set 21

There, you can select the Tableturf Battle option to view all your cards

This is slower/more expensive than Harmless Offering, which is a straight up donate effect also in standard right now, but it definitely is not worth splashing red for

Despite this I have rarely seen this be any thing other than decent