[Planechase]

(Planeswalk immediately. This phenomenon remains until it is dispersed.)
As long as there is an active plane, player's can't planeswalk.
Whenever a player draws a card, put a breach counter on Confinement Shell. Then, if there are seven or more breach counters on it, disperse this phenomenon.

(Planeswalk immediately. This phenomenon remains until it is dispersed.)
If encountering a phenomenon causes a triggered ability of a phenomenon to trigger, that ability triggers an additional time. When it does, disperse this phenomenon.

When you encounter Leyline Catastrophe, exile all lands until Leyline Catastrophe is dispersed. (Then planeswalk. This phenomenon remains until it is dispersed.)
When there are four or more lands on the battlefield, disperse this phenomenon.

When you encounter Memory Bubble, each player mills five cards, shuffles their graveyard, and returns three cards at random from their graveyard to their hand. (Then planeswalk away from this phenomenon.)

When you encounter Planar Conflux, reveal cards from the top of your planar deck until you reveal five cards. Simultaneously planeswalk to all planes among them that share a planar type with the first plane revealed this way. Put all other cards revealed this way on the bottom of your planar deck in any order. (Then planeswalk away from this phenomenon.)

When you encounter Planar Invasion, each player creates an Eternal Invader, a 2/3 black Zombie creature token, for each opponent. It can't block and attacks that opponent each turn if able. (Then planeswalk. This phenomenon remains until its is dispersed.)
Whenever an Eternal Invader dies, its controller discards a card.
When there is no Eternal Invader on the battlefield, disperse Planar Invasion. Each player draws two cards and gains 5 life.