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An interesting thing about leapfrogger is that its deathrattle is stackable, i.e., a minion is allowed to have multiple, say kk, deathrattles of the leapfrogger at the same time, then when this minion dies, it will randomly give a friendly beast(if there exists any) the effect of +1/+1 in stats and this same effect, repeated kk times. Note that in each of the kk times, the friendly beast is chosen independently at random. What makes things more interesting is a minion in Battlegrounds called Baron Rivendare that can double the effect of deathrattles when it is on the board. When Baron Rivendare is on the board, and a leapfrogger dies, its deathrattle is triggered and given to a random friendly beast, twice. If both deathrattles are given to the same friendly beast and that beast dies, still with Baron Rivendare on the board, each of the two deathrattles of leapfrogger on the beast is triggered twice, so that a total of four copies of the deathrattle of leapfrogger are triggered and given to a random friendly beast... The speed the deathrattle of leapfrogger spread when Baron Rivendare is on the board is quite insane and is what makes the "leapfrogger build" a possible and quite powerful strategy in Battlegrounds.

我英语太差，并且没玩过炉石，怎么看也看不懂，有没有人跟我概括一下啊 /kel

1. 仆从和跳蛙和野兽的关系是什么？

2. 什么叫 repeat $k$ 次？

3. Baron Rivendare 的作用是什么？