英雄の演壇

あなたがコントロールしているすべての伝説のクリーチャーは、あなたがコントロールしていてそれでない伝説のクリーチャー１体につき＋１/＋１の修整を受ける。
{X}, {T}：あなたのライブラリーの一番上にあるカードＸ枚を見る。「その中から伝説のクリーチャー・カード１枚を公開してあなたの手札に加える。」を選んでもよい。残りをあなたのライブラリーの一番下に無作為の順番で置く。

Heroes' Podium

Each legendary creature you control gets +1/+1 for each other legendary creature you control.
{X}, {T}: Look at the top X cards of your library. You may reveal a legendary creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Doctor Who

Dominaria United Commander

Heroes' Podium will give a bonus to each legendary creature you control, even if gaining control of one causes the "legend rule" to apply. For example, if you control Brimaz, King of Oreskos (a 3/4 legendary creature), and gain control of another one, they'll each be 4/5 when you put one into its owner's graveyard. Then the remaining one will return to being 3/4.

The bonus given by Heroes' Podium counts only legendary creatures. It won't count itself unless some other effect causes it to be a creature in addition to being a land (in which case it will also get the bonus).