And since you can tap your commander to untap Leyline Dowser, that can happen whenever your commander doesn't attack for the turn (or do anything else that requires tapping)
Draw two cards, then amass Zombies X, where X is the number of cards in your hand
Looking at the current metagame, it seems that Modern is moving away from broadly useful cards, and leaning into sideboard haymakers
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Cloud would totally be a better striker than Rooney.
To enlist a creature, that creature must be untapped, it must not be attacking (even if it has vigilance), and it must have haste or have been under that attacking player's control since the beginning of their current turn