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This effectively means the best return on your mana for Mystic Confluence is 4 as you can only effectively get one use out of the most valuable mode

So if you saw four cards, you get to pick four creatures

Here Esper Sentinel is doing one of its best jobs taxing your opponent for playing their game and creating card advantage

Giada also reads: Each other Angel you control enters the battlefield with an additional +1/+1 counter on it for each Angel you already control. This is an absurdly powerful ability and, while its definitely going to find a home in Commander, the low mana value means it could theoretically see play in any format you might find other angels