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When Summoning this card, it may be helpful to take into account the different types of "Rank-Up-Magic" Spell Cards available.
"Rank-Up-Magic Argent Chaos Force" is rightfully "Disaster Leo's" bread and butter. In "Gimmick Puppet" decks in general, the spell allows easier access to more Rank-Up Xyz summons, and "Disaster Leo" meshes well with the othertwo "Number C Gimmick Puppets," both of which feature burn/removal effects that augment "Disaster Leo's" offensive playstyle.
"Rank-Up-Magic Quick Chaos" pairs extremely well with "Disaster Leo"; in particular their normally restrictive conditions fit exactly. "Quick Chaos" can also be activated during the Battle Phase, working well into "Disaster Leo's" offensive style.
"Rank-Up-Magic Numeron Force" is an excellent choice to help "Disaster Leo" survive on a late-game battlefield where the opponent already has detrimental effects lined up. Even if the effect negation becomes a moot point, in general "Numeron Force" is a stronger choice over "Barian's Force."
"Rank-Up-Magic Admiration of the Thousands" is somewhat situational, as using it on the original "Leo" requires that your opponent have a Rank 8 Xyz Monster of their own in their Graveyard. However, if facing against the right Deck, it can be a useful surprise option from an empty field coupled with other Graveyard support that "Gimmick Puppets" have ("Junk Puppet", etc.). This card is also very notably the only way to Summon "Disaster Leo" without first successfully Summoning the original "Leo", in the case that "Leo's" Summon was negated or it was directly sent to the Graveyard (by "Gale Dogra", etc.). Note that "Disaster Leo" does not specify that "Leo" must be targeted on the field and so "Admiration of the Thousands" fulfills its Summoning requirements.
"Rank-Up-Magic Barian's Force" can grant "Disaster Leo" an extra Xyz Material to spend on its damaging effect if the opponent still have high Life Point.
Before Summoning this card, use "Oni-Gami Combo" on "Number 88: Gimmick Puppet of Leo" to detach its Xyz Materials and allow it to make a second attack this turn, possibly dealing a great deal of battle damage to your opponent. Then Rank-Up into this card and detach "Leo" to inflict a further 1000 damage. This card will be left with no Xyz Materials and your opponent should be left with low Life Points, hastening this card's victory condition.
Note that you must play "Oni-Gami Combo" on the original "Leo" and not this card, as this card cannot be targeted by card effects, including your own.
After attacking twice with "Leo", use "Rank-Up-Magic Quick Chaos" to Summon this card during the Battle Phase and attack again for even more damage.
You can use other cards that detach Xyz Materials but do not target, such as "Xyz Energy", "Space Cyclone", "Xyz Gift", and "Xyz Block" to hasten this card's victory condition. Many of these cards aim to give you card advantage, potentially allowing this card to make a direct attack and greatly lower your opponent's Life Points to the required 2000 or below.
Use "Xyz Territory" to give this card a large ATK boost. If that card would be destroyed by a card effect, it can also give you the chance to hasten this card's victory condition by detaching an Xyz Material from this card instead.
Use "Number Wall" to protect this card from most destruction on top of its targeting protection. This should make it very difficult for your opponent to stop this card.
One way to quickly meet this card's Life Point requirement is to use "Life Equalizer" to make both players Life Points 3000, then detach an Xyz Material from this card to drop your opponent's Life Points to exactly 2000 for an instant win.
One way to quickly Summon this card is as a backup in case an attempt at victory through the original "Leo" should fail. If a properly Summoned "Leo" is in your Graveyard, and you have a "Rank-Up-Magic Argent Chaos Force" in your hand or Graveyard, then you can use "Junk Puppet" to bring back "Leo", add "Argent Chaos Force" to your hand through its effect if it's not already there, then activate "Argent Chaos Force" on "Leo". This setup only requires a single card from your hand and two cards in your Graveyard. As a bonus, this card will only have a single Xyz Material which can be immediately detached.
After using one of the Rank 9 "Gimmick Puppets" to inflict heavy damage to the opponent, use "Purge Ray" during the opponent's turn to Summon "Leo", then Rank-Up into "Disaster Leo" during your turn. Again, this card will only have a single Xyz Material which can be quickly detached, and your opponent should be left with low Life Points for a quick automatic victory.